Replacing batteries in the screwdriver battery. How to restore a screwdriver battery yourself

Repairing screwdriver batteries with your own hands is a very real task, although somewhat labor-intensive. Before starting work, it is necessary to carry out high-quality diagnostics of the device, since it is not always possible to clarify and specify the breakdown immediately. In this way it is possible to identify fault locations and take right decisions for repair or replacement of elements. It is worth noting that several faults can be detected at the same time and all of them must be eliminated by restoration or replacement, therefore there is no need to delay resolving this issue.

What is a cordless screwdriver?

A cordless screwdriver is a tool designed for screwing in bolts, screws, self-tapping screws and other elements necessary to provide fixed fasteners. In addition, with the help of this unit you can carry out drilling work on surfaces made of metal, brick, wood and plastic.

Screwdrivers belong to the category necessary tools, which should be in the arsenal of both professional builders and home craftsmen. One of the most popular elements for a tool is a battery such as a battery for a Makita screwdriver. The quality of the battery for the Interskol screwdriver is not inferior to it.

What causes self-reproduction of battery repair

The price of the tool is based on the cost of factory-assembled elements, 70% of which is the battery, which is essentially the most expensive part of it. This structure must be handled carefully, strictly adhering to the prescribed instructions and taking breaks between work.

However, as practice shows, when breakdowns occur regarding the battery, technicians often wonder what to do in such a situation? Either repair the tool or buy a new screwdriver, because replacing the battery will not be cheap. However, it is worth considering the option of repairing screwdriver batteries yourself.

It turns out that if you set such a goal, then it is quite possible to put the tool in order and continue to use it successfully without spending extra money. There is no doubt that you will have to tinker a little and delve into all the intricacies, but the result is worth it.

Types of batteries for cordless screwdrivers

In order to reproduce the repair of screwdriver batteries with your own hands, you need to have an idea of ​​the types of batteries. All screwdrivers, regardless of their brand and manufacturer, are identical in structure.

The structure of a screwdriver battery can be understood if you disassemble its unit, which consists of several elements assembled in a certain sequence. The provision of electricity at the moment is carried out by different basic elements that differ significantly from each other.

Among the batteries are:

Nickel-cadmium;
nickel metal hydride;
lithium-ion.

Characteristics of batteries and the possibility of their “reanimation”

Lithium-ion battery cells for screwdriver repair are of the highest quality and have a long service life. However, they do not have a memory effect, and their only drawback is the inability to function at sub-zero temperatures. However, as practice shows, manufacturers simply try not to advertise the negative aspects of their products. For example, lithium, as it expires service life tends to decompose, and unfortunately nothing can be done about it.

As for nickel-cadmium batteries, they dry out after a certain period of time. But here, unlike lithium-ion cells, with the proper attitude and the right approach to their “reanimation”, there is the possibility of refilling. And if the banks were affected by the memory effect, then, according to electricians, they need to be reflashed. However, these processes are painstaking and long, so most often the issue is resolved by completely replacing the elements.

Well, if we start talking about repairs regarding nickel-metal hydride batteries, then unfortunately there is no other option other than replacing them.

Charging the screwdriver battery

It goes without saying that if under renovation cordless screwdriver imply battery repair, then in this situation, every structure without exception is subject to restoration. Today, it is possible to buy lithium-ion, nickel-metal hydride, and nickel-cadmium batteries at a relatively low price. Installing them yourself involves disassembling and assembling the battery and replacing the filling, which in principle should not cause any particular difficulties.

Carrying out fault diagnosis

The first step is to disassemble the battery and accurately determine the location of the fault. The entire circuit will be non-functional if at least one element is damaged. A faulty one is determined using a multimeter and a 12-volt lamp. To do this, the battery is charged until it is completely charged.

Next, the housing is disassembled and the voltage is determined. It should be measured in each element of the circuit. If “cans” with performance below the nominal value are detected, they are marked, after which the battery must be assembled and put into operation until the power drops.

Then the structure is disassembled again and the voltage of the elements is measured again. In the marked subsidence areas, the stress is monitored more clearly. The presence of a difference in different elements, starting from 0.5 V, indicates their imminent failure, even if they continue to work for some time.

Possibility of restoring the battery capacity of a screwdriver by flashing nickel-cadmium batteries

Repairing screwdriver batteries in this way with your own hands can only be suitable when the batteries are not subject to drying out. If this does happen, then unfortunately, we can state that they cannot be restored, and there is nothing left to do except send them to a landfill. It is possible to verify the state of the electrolyte in the cells only by practical means: if the method does not work, then they are dry. If it works, then everything is in order, very soon you will be able to use the screwdriver as usual. Charging of the screwdriver elements is carried out using high current and voltage.

The procedure for restoring the battery using flashing

The entire flashing process is as follows:

The battery is disassembled;
the charging of all elements included in its composition is checked, without exception;
then a high-power charger is connected to the batteries and adjusted accordingly to ensure that each cell is supplied with a voltage of approximately 3.6 V.
Charging of the screwdriver battery is reproduced with a short-term current supply: 5 seconds;
then the result is checked by measuring the voltage readings with a multimeter. If these numbers in each charged element reach the limit of 1.5 volts or higher, then everything went well;
After control, the battery is assembled and used as usual.

This method allows you to neutralize the memory effect of nickel-cadmium batteries. If charging fails, the cells are desoldered and disposed of. The only option in this situation is to install new batteries in place of the damaged ones.

Identifying and replacing used containers in a screwdriver

When deciding whether to repair a screwdriver battery, you should take into account the difficulty that arises when opening the battery. The fact is that they are almost always carefully sealed. And this is understandable, because it is beneficial for manufacturers to motivate the average person to buy a new element, and not to repair it themselves. Therefore, one way or another, you will have to “sweat” a little.

If you want to carefully get to the internal contents of the battery, it is still possible, which is the main task.

The remaining steps here are quite simple, and their order is as follows:

Before starting manipulations, the 12V battery for the screwdriver is charged;
after opening the battery, the batteries are removed from it;
then the voltage on each element is checked. The readings are recorded;
the next stage in the work: connecting voltage to identify weak points;
then the voltage is measured again and those that are poorly charged are identified: they must be replaced with new ones;
items are purchased according to the labeling. If you decide to replace them in full, it will be a little more expensive, but you won’t have to worry about looking for the weak link:
all elements are soldered in a strict sequence of plus and minus, installed in the battery and resealed

What to pay attention to

The most important thing in this matter is to look at things soberly and not worry that something may not work out. However, you cannot do without taking into account the subtleties, and you will have to be as pedantic as possible when it comes to self-repair. The factory technological process involves welding the plates used to connect the elements.

At home, you can only use a soldering iron. It is important to take into account that the elements should not be subjected to severe overheating, and it is necessary to know that they all must be similar in capacity and voltage output. Repairing a screwdriver battery with your own hands is not such a difficult task for good master. The main thing here is to have incentive, desire and love for this business.

A screwdriver is one of the hand tools that every craftsman should have in his arsenal. If treated properly, it can last for many years. But when repairs are “underway,” anything can happen, and if it falls from even a small height, it or its battery can get damaged and stop working. This is what happened to the instrument that was brought to me for repair. When dropped, the screwdriver's battery failed (found out by repositioning the worker). This problem can be solved on your own without spending money on a new tool!

Repair

The battery compartment cover was secured with four screws. Having unscrewed them, I saw that the jumpers (plates) between the batteries were simply torn.

The jumpers to the batteries are usually spot welded. Since I don’t have such welding, I always solder the jumpers using a soldering iron with regular solder.

For the repair I needed:

• soldering iron;
• sandpaper;
• flux;
• solder.

When replacing or repairing torn cans, I first clean the soldering areas sandpaper. In order for the tinning to be of high quality, it must be cleaned as thoroughly as possible; the quality of the soldering itself will depend on this, which, in turn, will also affect the throughput of the current passing through it.

Instead of flux, you can also use rosin (in this case it is not very convenient), soldering acid (some destroy soldering over time, toxic fumes), an aspirin tablet (strong smell when melting). I do not recommend using the last two methods at home.

Finally, observing the polarity, I solder the torn batteries back into place and assemble the battery.

It seems that nothing is easier than picking up a soldering iron and using simple manipulations to solder the batteries into place, but not everything is so simple when soldering nickel-cadmium (Ni-Cad), nickel-metal hydride (Ni-MH) and similar batteries; there are some nuances. Failure to comply with the subtleties can lead to both the unusability of the battery (a sharp drop in capacity) and its charger.

If you decide to repair a failed battery yourself, be sure to pay attention to the following points!

The batteries are connected in series, that is, the minus battery to the plus of the next one, etc.

On batteries, the polarity is sometimes not indicated; in such cases, it is advisable to find out with a multimeter (usually the convex and smaller diameter plus end).

If there is no device, then you need to look at how the other cans are connected to each other and solder them in the same sequence.

Ni-Cad, Ni-MH and similar batteries are very sensitive to high temperatures, so contact of the soldering iron with the battery should be minimized! In this case, it is better to take the soldering iron itself more powerful (60 watts or more), so that with a short touch it will have time to heat and solder the soldering area, but without having time to heat up the battery body itself.

At home, it is better to use flux or rosin for tinning and soldering.

Battery types

Based on design features, batteries are distinguished in the form of sliders and clips.

Screwdriver battery in the form of a slider

But these are minor differences compared to battery types. Both the slider and the clip are used in different types of batteries.

Screwdriver battery in the form of a clip

There are three types of batteries for screwdrivers:

1. Nickel - cadmium (Ni-Cd).
2. Nickel - metal hydride (Ni-Mh).
3. Lithium - ion (Li-Ion).

Lithium polymer batteries (Li-Pol) are not produced for screwdrivers. Their main areas of application: smartphones, cell phones, tablets, laptops, radio-controlled devices, electric vehicles.

Nickel-cadmium batteries are the cheapest, charge quickly, and have more than a thousand charging cycles. The batteries are resistant to operation at low temperatures. But they have a memory effect. That is, they can be charged only after they are completely discharged, otherwise the capacity will drop. They have a high self-discharge current. They are made from toxic materials and are difficult to dispose of. These batteries are in greatest demand.

Nickel metal hydride batteries are more expensive, non-toxic, and have a low memory effect. The self-discharge current is greater than nickel-cadmium. The capacity is higher, the charge cycle is more than five hundred. These batteries are less resistant to high discharge rates. They are less suitable for maximum use tool power. They need to be constantly recharged.

Lithium-ion batteries are more expensive, more powerful, and charge quickly. They have no memory effect. Low self-discharge current. The voltage of the battery cells is higher, so their number is smaller. Consequently, the dimensions and weight of such batteries are smaller than those of nickel ones. But they cannot be completely discharged, otherwise after several such cycles you will have to buy a new one. To improve the quality of lithium-ion batteries, manufacturers install a microcircuit in the case of the battery or screwdriver that controls the operation of the battery. A multi-level multi-stage protection is formed:

1. From high temperature.
2. From full discharge. These batteries are afraid of being completely discharged and cannot recover if the discharge is below the permissible norm.
3. From short circuit.
4. From overcharging, as an explosion may occur.
5. From overload currents.

A control board installed in the battery case is more efficient. When the battery is kept separate from the screwdriver and is not in use, the microcircuit monitors its condition and, in case of any problems, opens the circuit. The battery is completely protected.

Review of lithium-ion battery with chip

Problems with the battery

What problems can occur with batteries:

• flows;
• cannot be removed;
• capacity has decreased;
• not charging;
• charging and discharging times are reduced.

Nickel batteries can be refurbished. But lithium ones are not allowed, since lithium decomposes in them. Here you can only replace unusable batteries.

How to properly repair it yourself.

Be patient and start repairing.

Let's disassemble the battery.

Disassemble the battery carefully. Do not use force to avoid damaging the housing.

Video: How to disassemble a screwdriver battery

Inside there are several elements soldered in series. This cassette provides the necessary voltage and current characteristics for the battery. Some nickel batteries have a temperature sensor attached to the cells.

Nickel battery temperature sensor attached to cells

In lithium-ion batteries, everything is more complicated. There is a control board, and the elements are covered in a protective case or film.

Lithium ion battery

How to increase battery capacity.

A new battery must be fully charged before use. The average ambient temperature is from 10 to 40 degrees. The chargers have indicator lights. When they show that the battery is charged, you must immediately turn off the process.

1. New nickel-cadmium batteries must be rocked before first use. Fully discharge and charge three times. The capacity will become maximum. If the instructions for the device say that the build-up should include a greater number of charge cycles, then follow these recommendations. During operation, fully discharge the battery before charging.
2. Nickel metal hydride batteries have less memory effect, so they can be cycled once before first use.
3. Lithium - ion batteries no need to swing. They simply need to be charged to full power.

To discharge the battery, a load in the form of a 12-volt lamp is used. It is connected with crocodile clips to the terminals. If the battery is disassembled, then to the terminals of the serial battery circuit. The discharge process will take less than an hour.

Video: How to drain your battery

The second way to properly discharge is to use a “smart” charger like imax b6, which is very convenient for charging batteries. In it you can configure the current and voltage parameters for charging and discharging the battery. Set the automatic cycling mode to boost the battery. That is, you do not need to constantly monitor the capacity and voltage. The device will do this for you. Up to 5 cycles are provided. Moreover, at the end you will be able to see the current and voltage values ​​​​after each cycle and analyze the result.

imax b6 charger

Video: Review of the imax b6 charger

Diagnostics.

Once fully charged, disassemble the battery. Inspect the elements for swelling and oxidation. Use a multimeter or tester to measure the voltage of all elements. Voltage limits for different batteries:

1. For nickel - cadmium 1.2 - 1.4 volts.
2. For nickel metal hydride 1.2 - 1.4 volts.
3. For lithium-ion 3.6 - 3.8 volts.

Diagnostics with a tester.

Diagnostics with a tester

Battery cans are wrapped in paper casing. The voltage is plotted on each element. If all banks have normal voltage, discharge the battery to half capacity. Measure the voltage again. Those elements whose voltage has decreased by 0.5 - 0.7 volts compared to the average must be restored or replaced. They say about such banks that they “leak”.

Video: How to check the battery status

Why isn't it charging?

If the charger is normal, check the contacts between the battery and the charger. The contacts on the charger may have become unbent. Because of this, the battery does not charge. Disassemble the device and bend the terminals. The second reason may be a faulty or unsoldered temperature sensor. It needs to be soldered or replaced with a new one.

Charges and discharges quickly.

When the contacts of the battery, charger and tool become oxidized and dirty, the battery quickly charges and discharges. Clean contacts periodically.

Electrolyte boiling away.

Electrolyte boiling occurs due to accelerated charging and overcharging. If the cells are not swollen and show operating voltage after a full charge, they can be restored without replacement. It is necessary to replenish the empty volume with distilled water.

• After identifying the defective cans, cut the connecting metal tape. Unsolder the elements.
• Take a punch no more than 1 millimeter thick. Where the minus is on the can, make a hole in the body.
• Pump out up to 1 cubic centimeter of air and pour in the same amount of water.
• Epoxy resin seal the elements and connect them to the circuit.

If this method does not help, then replace the jars with new ones.

Video: Adding distilled water

Replacing and soldering batteries.

When you have carried out diagnostics and identified defective cans, you need to purchase replacements. New elements must match exactly in size and technical characteristics.

Video: Replacing elements in the battery

How to convert a screwdriver to use a lithium-ion battery.

Many owners of a screwdriver with a nickel-cadmium battery have encountered the problem that when they need to use it, the battery is always low. And constant charging kills it due to the memory effect. Therefore, such a battery is converted to lithium-ion.

Source lithium batteries can be old battery from a laptop or you can buy new ones. Laptops and new banks are unprotected. You cannot use them without protection, because you will not be able to charge them and control the discharge. And when recharged, they will die safely. It is allowed to connect absolutely identical batteries in parallel, then they will work as one unit. Purchase a battery protection module for series-connected batteries that monitors and takes care of each cell individually. Monitors voltage and current, provides short circuit protection. Such modules are available for one, two, three and four batteries.

Battery compartments for different numbers of batteries

Holder for 1 battery

Holder for 2 batteries

Holder for 3 batteries

Holder for 4 batteries

To increase the capacity, parallel connected elements can be added. Lithium batteries cannot be soldered. They can be placed in holders and the contacts of the holders can be soldered. Or connect with nickel-plated tape and resistance welding, which allows you to quickly heat a very small area without harming the battery.

For resistance welding we will need:

1. Powerful high current source. This could be a converted microwave transformer or a lead battery.
2. A thick copper stranded wire, at the ends of which single-core copper contacts are fixed at a distance of four millimeters.
3. Metal tape. It is inexpensive, and you can connect about five assemblies with it. This is much more profitable than holders.

Place the tape on the battery, press the contacts where they are welded. Apply current briefly. On a battery, this can be done by making sharp short contact with the terminal. A button is placed at the input of the primary winding of the transformer. For ease of welding, connect the elements with glue. Cook according to the diagram, bending small pieces to attach the test leads for the module. Solder the “+” and “-” of the entire assembly to the module.

Connection diagrams with a controller for two, three and four elements

The output from the battery must be made with thick wires. If you don't have heat shrink tubing large diameter, wrap everything with electrical tape. The resulting battery will be very compact and neat.

Heat-shrink tubing.

Heat shrink tube for batteries

Take the old battery and disassemble it. Leave only the protective thermal sensor in it, since without it the charger will not work. Solder the new battery and fill the free space with foam or cardboard.

Video: Converting a battery to lithium ion

Now the most important thing. How to charge such an assembly? You need to charge with a voltage equal to the sum of the maximum permissible voltages on each battery. The recommended charge current should be half the capacity of one battery. Such a customizable source is a complex charger like the Chinese imax B6. In it you can set the number of batteries and the required charging current.

Restoration and repair

Basic methods for restoring nickel batteries:

Compaction (compression).

Elimination of memory effect.

Adding distilled water instead of boiled-off electrolyte.

You can use pliers to compress the jar carefully and evenly over the entire surface. Be careful not to damage the contacts. The electrolyte will become denser and its storage capacity will be restored.

The memory effect is easily detected. Once fully charged, the battery discharges quickly during operation. A few hours later it is functioning again. To erase the memory effect, apply to the battery electrical impulse capacity larger than usual.

Video: Flashing a battery with a higher capacity and voltage to erase the memory effect

The elements in lithium-ion batteries cannot be restored. They are replaced by workers. It is necessary to unsolder the control board, and non-working elements replace and assemble in the same way as when converting a battery into a lithium-ion one.

Video: How to replace lithium-ion battery cells

If the lithium-ion battery does not charge using its original charger, try using the imax b6. Set the mode to “nimh” and watch the voltage carefully. When it reaches 3 volts, switch to “liion” mode. Continue charging as normal. This process needs to be done briefly. And be sure to control the tension. If you leave the battery charging and forget about it, it will overcharge and fail. If this does not help, then look for defective batteries and change them.

Video: Charging a lithium-ion battery from imax b6

How to store

Before use, be sure to read the instructions for the device.

Discharge nickel-cadmium batteries before storage, but not completely, but so that the screwdriver does not work at full capacity. After long-term storage, shake the barathea in the same way as before the first use.

Video: Advantages, disadvantages, operation and storage of nickel - cadmium batteries

Charge Nickel Metal Hydride batteries fully before storing. If you do not use it for more than one month, recharge it periodically. After long-term storage, leave the charge for a day.

Lithium ion batteries can be charged at any time. They have the lowest self-discharge current. The main thing is not to discharge them completely. If during operation the tool stops working at full capacity, do not take risks. Charge the battery.

As you can see, battery repair is not that difficult. If you carry out the diagnostics correctly, you can repair all types of batteries yourself.

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postroika.biz

Quick repair of a screwdriver battery with replacement of batteries yourself

Hello! Today we will repair the screwdriver battery. Do you know that the history of the creation of a screwdriver goes back to the deep Middle Ages - all the way back to the 15th century, when knights put on armor before battle, and squires helped them twist parts of the armor with guess what? With a screwdriver!

This went on for a long time, until in 1907 the Canadian inventor Peter Robertson patented the Robertson screw with a standard square hole, into which the tip of a screwdriver was inserted. From that time on, screws began to be produced in industrial scale and apply in household. Later, in 1934, inventor Henry Phillips modified the screw head and a screw with a Phillips notch appeared, into which a corresponding screwdriver was inserted. By that time, the engine had already been invented and the idea of ​​​​creating a “rotator of screws and screws” was in the air. However, there were big problems with the batteries - their weight and dimensions. The problem was solved only in the 1980s, when the first nickel-cadmium Ni-Cd and lithium-ion Li-Ion batteries appeared.

The USA and Japan were the first to master the production of household and professional cordless drills and screwdrivers. All this happened thanks to the advent of new energy-intensive electricity batteries. We will urgently change them inside the Interskol DA-10/10.8 ER cordless drill/screwdriver that fell into my hands. The malfunction was as follows: when the button was pressed, the engine simply did not spin, but the LED lighted up, although the light was weak.

Let's start repairing the screwdriver battery by removing the battery

from the screwdriver handle and unscrewing the three screws that are located under the sticker at the bottom.

After unscrewing the screws, carefully move the hooks of the latches as in the photo and remove bottom part plastic battery case.

Inside we see lithium-ion banks of the Chinese company HighStar model ISR18650-1300 Li-Ion - which means that the batteries have never been changed, because it is known that Interskol purchases batteries from this company and inserts them into almost all of its cordless tools .

The photo below shows the insides of the screwdriver battery in all its glory with three banks produced back in 2011. These batteries lasted five years during active use on a construction site, so the result is very worthy - they usually die earlier, probably they were not used in cold weather.

To replace the battery banks you need to disassemble it further. I advise you to remember the location of the plus, minus and charging contacts so as not to confuse the wires when reassembly.

Pay attention to the voltage control board on the batteries - especially often the stabilizers and protective diodes on it fail. You definitely need to test the suspicious radio elements on this board with a multimeter.

We check the voltage at the battery output - it turned out to be 4.4 volts, but it should be 3.7 x 3 = 11.1 volts normally and 10.8 volts with minimal battery charging. In general, the banks are dead - they definitely need to be changed.

We continue to disassemble the battery of the Interskol screwdriver.

This can be done in several ways - you can unsolder the wires that go to the board.

You can also simply remove the contacts from the top cover of the batteries - the photo shows what shape the curved contacts have, so you can easily remove them yourself.

Under plastic cover We see how the batteries are connected to each other - they are spot welded - this is used in almost any battery of another tool - this is a reliable and gentle connection of the batteries - while the destructive heating of the lithium batteries themselves is minimal.

Carefully tear off or bite off the metal tape with pliers to disconnect the cans from each other. On the board side, they are also connected to each other with tape and placed with glue on a cardboard spacer so as not to short anything on the board. You must remember to return it to its place when reassembling the battery.

Due to the lack of a spot welding machine, we will solder new lithium-ion batteries with a well-heated, powerful soldering iron very quickly. We remember that heating lithium-ion batteries reduces their service life and is generally explosive.

Pay special attention to the condition of the wires inside the battery - they may be broken or frayed - they need to be properly insulated or replaced with fresh ones. Since I was repairing the screwdriver battery on the road in field conditions, then I had to use a brilliant invention of an engineering mind - blue electrical tape.

When disassembling the battery of the Interskol DA-10/10.8 ER screwdriver, I was pleasantly surprised - a thermal sensor was installed in the budget screwdriver to monitor the temperature of the batteries. It turns out that if the lithium cans overheat, the protection circuit turns off the power until the temperature is restored to normal. True, the owner has never been able to drive him into this mode. We carefully tear off this thermal sensor so as not to break it - then we will place it in the same place on the new cans.

Solder the batteries

It can be done in different ways, for example with thick wires. I decided to solder some torn metal strip taken from old cans. First, I tinned the tapes in the places of future contacts on both sides, then, using a well-heated soldering iron with a drop of solder, I tinned the battery contacts, but so that they did not heat up too much - I let them cool. Then I pressed the tape to the contacts of the cans and soldered the tape, again without overheating the battery cans too much.

The most difficult thing to solder is the negative terminals, but with good flux it goes very quickly. True, it is better to wash the flux later to clean the insides of the battery.

Now the most important thing is what batteries were used when repairing the battery of the Interskol DA-10/10.8 ER screwdriver, you ask? Well, I won’t hide it - these were the cheapest Chinese cans that the owner of the device honestly bought in the store. 18650 size batteries from Bailong with a fictitious capacity of 8800 mAh. This is, of course, a laugh and God forbid that they had 2200 mAh, and judging by how long the screwdriver worked after the repair on a full charge, I would reduce this figure by half. But nevertheless, the screwdriver was urgently repaired and makes the owner happy.

When assembling, do not forget to replace the cardboard spacer between the cans and the board so that fresh soldering does not short-circuit anything on the board.

This completes the repair and restoration of the lithium-ion battery of the Interskol DA-10/10.8 ER screwdriver. Almost all batteries from popular screwdriver manufacturers are repaired in approximately the same way: Bosch, Makita, DeWALT, Metabo, Hitachi, Elitech, Skil and my favorite Bison. This concludes my story about repairing a screwdriver battery. Ask questions in the comments, or even better, in the corresponding thread on our forum or write to the Soldering Master personally by email.

Sincerely, Master Pike. Happy renovations!

masterpaiki.ru

Screwdriver battery repair: how to restore the battery

Any screwdriver is equipped with two battery packs, which allows you to work with it for a long time. But sooner or later you have to deal with the fact that the battery runs out, does not charge at all and needs to be replaced. Buying a new one is often difficult, and if you succeed, it is at a very high price. That’s why they say that it’s easier to buy a new tool or repair the screwdriver battery yourself.

On the Internet there is a large number of videos in which electronics enthusiasts clearly show how to repair a screwdriver battery with their own hands. If you are seriously concerned about the issue, think about saving Money and whether it is possible to repair a screwdriver battery with your own hands, watching such videos can be a good start for repairing the battery yourself in the future.

How to disassemble the battery

Battery packs home tool their design is almost identical to each other, regardless of the model of the tool (Bosch, Makita, Hitachi). They are packaged in a plastic case consisting of two parts. The number of batteries may vary depending on the output voltage of the tool used. All elements are soldered in a certain sequence. The lead ends or terminals at which the battery voltage is usually measured are brought out.

Most screwdriver or drill battery packs are designed so that they are very easy to disassemble, regardless of whether we are repairing the battery of an Interskol screwdriver or another model. Several mounting screws need to be removed using a regular screwdriver. There are batteries that are difficult to disassemble, but can be disassembled with a screwdriver and a penknife. The adhesive layer is removed with a knife, and the two mating surfaces are moved apart with a sharp self-tapping screw.

The difference between screwdriver batteries and each other may lie in the presence or absence of a temperature sensor, which automatically turns off the battery under critical heating conditions (above 50°C). The sensor constantly monitors the temperature not only under load, but also under the conditions of the current battery charge. The controller reads all the data and processes it, “remembers” the capacity and other indicators. As soon as the capacity reaches 80-90% and the voltage reaches 14 V, the control unit turns everything off. Such batteries last for years without losing their technical characteristics.

There are a large number of inexpensive screwdriver models on the market. Cheaper devices do not have such technical devices, and you need to monitor all processes yourself.

Types of battery repairs

How to reanimate a screwdriver battery? There are three ways:

• express battery repair using zapping method;
• replacing individual elements in the battery;
• replacement of all elements of the battery pack.

Express repair of nickel-cadmium batteries using zapping method

Translated from English, this means burning through a nickel-cadmium battery by applying short pulses of high current over a period of several seconds. We can say that this is a kind of emergency resuscitation of batteries. It should be noted right away that this option is quite risky, and not every battery is able to withstand such “shock therapy” with high current. It is possible to use high current only if the screwdriver has nickel-cadmium batteries installed. Other batteries (nickel-metal hydride, lithium-ion) should absolutely not be exposed to such effects.

The essence of purging is to destroy the crystals formed inside nickel-cadmium batteries with high current. These crystals are called dendrites, and due to their growth, the battery capacity gradually decreases. “Pumping” with high currents quickly destroys the formed crystals and sharply reduces the self-discharge of the battery.

It is stated that zapping can be effective for any NiСd, even if they are completely discharged to zero or have been lying unused for 10 or 20 years. The question is always one of probability. successful repair in such “difficult” cases - when batteries are “repaired” in this way, it will either be successful or not. However, it doesn't hurt to try to revive them. Of course, while maintaining maximum caution.

To carry out zapping you will need:

• any high-current charger;
• multimeter to monitor voltage;
• welding machine;
• crocodile clip;
• zapping electrode;
• protective equipment.

You should not use a regular power supply as a charger. Even if the current strength of such chargers is 10-15 A, they will not withstand high voltage. Using a double-sided clamp, tight contact is ensured on one terminal, and the electrode itself will be held on the other terminal. It is impossible to hold it with your fingers: during burning it will become hot. A zapping electrode is a piece of wire that is rolled into a tight bundle (there is no insulation). Its cross-section is maximum 1.5 mm2, and its length is 6-7 cm.

Instead of higher quality welding machine Especially daring electronics enthusiasts repair batteries using a regular soldering iron. But a spot soldering tool will be preferable for repairs. Protective equipment (robe, goggles, special non-flammable substrate) is necessary because sparks always appear during high current blowing.

Work progress

It is better to blow through each battery separately, the algorithm is as follows:

• Attach the electrode with a minus sign to its minus pole. Do not confuse the polarity, an important point.
• “Blow out” the positive electrode with short pokes, their frequency is 2-3 times per second. Typically, for a can with an output voltage of 1.2 V, blowing must be done for 3-4 seconds with a frequency of 2-3 small pokes per second;
• Measure voltage readings after the first stage. It should be raised to a maximum of 1.3 V. If the voltage is higher, the time of pokes or their number should be reduced.

You need to poke very quickly and carefully, not allowing the electrode to weld even for a short time to the pole of the Ni Cd battery of the screwdriver, in order to avoid completely burning the battery. It is recommended to put a protective intermediate electrode on the positive electrode, or to hook on an alligator clip to protect the surface of the battery pole.

The procedure is repeated up to 25 times until the battery capacity is restored. During the entire process, it is necessary to constantly monitor the temperature of the batteries. The intervals between zappings should be at least 15 minutes. Only in this case will the reanimated battery have a chance to extend its service life.

Replacing individual elements in the battery

If the battery capacity drops, it means that at least several of its elements have failed. All batteries cannot die at once, so first you need to find the lowest-capacity batteries in the chain, and then disassemble the battery and replace them with new ones.

New batteries can be ordered from any online store. At the same time, it is important to buy those elements whose type and capacity fully correspond to the previous ones. If the screwdriver contains nickel-cadmium batteries, then you should purchase the same ones, with a similar level of capacity. If you can get the same battery, you can remove the most capacious elements from it and put it in the one that is being repaired.

How to identify “weak links”

Searching for dead batteries in a circuit can be done in two ways:

• using a multimeter;

For the first method you only need a multimeter:

• charge the battery completely;
• disassemble the battery case;
• measure the nominal U on each battery (the rating for nickel-cadmium batteries is 1.2 V, for lithium-ion batteries - 3.6 V);
• mark with a cross the elements where U is lower than nominal so as not to be confused with others;
• assemble the battery;
• turn on the screwdriver;
• work with it until there is a noticeable decrease in power;
• disassemble the battery again, measure the U values ​​again.

On batteries marked with a cross, the “dips” in voltage will be significantly greater than the others - most often below 1 V. As for the difference between the U values ​​in the battery, if it is at least 0.5-0.7 V, this is quite significant.

The second method of finding dead batteries is less labor-intensive and simpler. If the screwdriver output voltage is 12 V, you will need a lamp with the same output voltage.

Procedure:

• fully charge the battery;
• connect the lamp as a load to both poles of the battery;
• wait until the battery is completely discharged;
• Use a multimeter to measure the voltage readings at the terminals of all elements one by one.

“Dead” batteries are easy to separate because their voltage drops the most after discharge.

Repair

So, the failed elements have been found, new ones have been purchased, and now you can proceed directly to repairing the battery.

To repair the battery you will need:

• soldering iron;
• low-corrosive flux;
• tin;
• copper plates (in case the “original” ones broke during disassembly).

It is not necessary to use spot welding in case of partial battery repair. But during soldering you need to be careful not to overheat the elements. It is best to connect the batteries to each other using the plates that they had. If they break during disassembly of the battery into individual elements, then new copper plates will need to be made.

We should not forget about polarity. Each battery element for a screwdriver is connected to its neighbor according to a certain sequence. The minus of one can must be connected to the plus of another, and the minus of another can must be connected to the plus of the third, and so on.

After the chain is reassembled, care must be taken to ensure that the voltage potential of all elements is equal. To do this, you should leave the batteries on charge for the whole night, then they should cool down over the next 24 hours. After this, the voltage is measured on each element. If the soldering and charging cycle were carried out correctly, the multimeter will show approximately the same U figure on all batteries - 1.3 V.

Now you need to carry out at least two charge-discharge cycles for the battery in a natural way: place the repaired battery in a native screwdriver and work with it until it is completely discharged.

By the way: partial repair of a Li-ion screwdriver battery can be carried out in a way that requires minimal financial costs. If the unit has 18650 batteries installed, you can actually borrow the same ones from an old non-working laptop, if possible.

Replacing all elements of the battery pack

The required number of elements can be ordered at any online store, depending on the number of old batteries. It is important to pay attention to the fact that they all initially have the same capacity.

You can completely replace all elements of the battery pack with new nickel-cadmium batteries. They are much cheaper than nickel-metal hydride batteries, and, compared to other batteries, they are the most durable and hardy. However, in Lately Increasingly, self-conversion of batteries “from cadmium to lithium” is being practiced, in other words, installing new lithium-ion batteries instead of old Ni-Cd.

Despite their reliability, nickel-cadmium batteries can quickly fail because they are connected in series to each other without a balancing board. If the batteries are from the same production batch, their parameters will still have a wide spread between them. With this connection, one element will charge faster, another slower, and the third may overcharge.

If cadmium battery manufacturers made balancing boards like they do for lithium batteries, Ni-Cd could last much longer. But this is simply not profitable for manufacturing companies. As for lithium cells, balancing boards are installed in such battery packs because without them, overheating and subsequent explosion can occur: here manufacturers simply have nowhere to go. You can find out which battery is best for a screwdriver here →

To completely replace the batteries in a screwdriver from nickel-cadmium to lithium-ion, you will need:

• the number of elements is equal to the number of previous ones (with the same capacity);
• 5S balancing board (its amperage depends on how many volts the screwdriver is designed for);
• tester or multimeter;
• soldering iron with a good tip;
• high-quality flux and lead solder;
• silicone wires AVG 16;
• heat-resistant tape and hot melt adhesive.

Before starting soldering, discharge the batteries. Remove the old batteries from the unit and release the contacts. It is better not to throw away the old temperature sensor, but leave it as additional protection against lithium overheating.

Now the main thing is to solder the lithium correctly. Cut the wires to the required length in advance, insulated, in silicone, very thick, to avoid them melting when the lithium is heated. Use a knife to clean the battery pads for soldering.

It’s good to heat the soldering iron to 300°C and start soldering using flux and lead solder. There must be flux good quality, indelible, non-conductive. Do not use acidic fluxes under any circumstances. Soldering should not take more than 2 seconds to avoid overheating of the lithium. In order for the heat to escape faster, after soldering, you can attach any iron object to the battery that absorbs heat.

Allow the batteries to cool and connect the positives and negatives as usual. Check the overall voltage. Its indicator should be on average 20.7 V if there are 15 elements.

After measuring the voltage, the board is connected. All its wiring must be laid with special gaskets so that nothing “shorts” during operation. The entire battery pack is sealed with heat-resistant tape designed specifically to insulate batteries and their contacts.

The wires and connector are soldered. If the contacts are “dangling”, they can be attached to hot glue. Now, finally, you can finally assemble the screwdriver battery pack and check its operation.

Sometimes it seems like repairing the battery Hitachi screwdriver(or another tool) is very difficult. But if you understand the general principles, such as the basics of electronics, the internal structure of batteries, types of batteries and the main principles of proper soldering, it becomes clear how to repair a screwdriver battery yourself. This will not only save financial resources, but will also contribute to the acquisition of valuable and useful skills.

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Do-it-yourself screwdriver battery repair, how to check with a multimeter, restore the battery and replace its elements

In the arsenal of any good owner there will probably be a power tool that is common in everyday life - a screwdriver. Its main advantage is mobility. After all, this device runs on removable batteries, which makes its use as convenient as possible, since it does not require connecting to a power outlet. But what if the battery of the screwdriver fails? Buying a new one will be quite expensive, because its cost in some models reaches 50–70% of the price of the screwdriver itself. It will be much more practical to immediately purchase a new tool, which includes two batteries. But you can still extend the service life of an old screwdriver by repairing a failed battery.

What is a screwdriver battery?

In any models of electric screwdrivers this important element, as a battery, looks about the same. He is plastic box, inside of which up to a dozen (and sometimes more) batteries are placed. They are connected to each other in a serial chain and are arranged in such a way that the terminals of the first and last jar in the chain are closed to contacts that provide power to the tool and connection to the charger.

A screwdriver battery is a chain of rechargeable batteries connected in series

The batteries of any type of screwdriver have quite simple design, which anyone with at least a little knowledge of the basics of electrical engineering can easily understand. In addition to batteries, the battery housing may contain:

Depending on the type of batteries used, screwdriver batteries are of the following types:

• nickel-cadmium, designated NiCd and designed for a nominal voltage of 12 V;
• nickel-metal hydride (NiMh) with the same rated voltage as the first type elements (12 V);
• lithium-ion (Li-Ion), the voltage of which, depending on the number of elements used, can range from 14.4 to 36 V.

Different types of batteries provide different nominal voltage and power for the screwdriver

Rechargeable batteries of the first type (NiCd) are the most common in modern tools, primarily due to their lowest cost. Batteries based on nickel-cadmium alloy can be found especially often in budget models of screwdrivers. They are not afraid of low temperatures and can be stored in a discharged state without losing their characteristics. The disadvantages of such batteries include:

• bright pronounced effect memory, when, when the charge is not fully depleted, the battery seems to remember to what value its capacity was used, and in the future it is no longer charged above these parameters;
• small capacity and small number of charge and discharge cycles;
• susceptibility to self-discharge, when an unused charged battery gradually loses its charge;
• high toxicity when opening the can due to the cadmium contained in the battery.

To ensure that a new battery for a screwdriver does not lose capacity, it must be charged for 10–12 hours the first few times, even if an indication appears that it was charged much earlier. During operation, it is better to use the battery until it is completely discharged, and then immediately connect it to a charger until it is fully charged.

Nickel-metal hydride elements are also common in modern screwdrivers. They consist of environmentally friendly elements, but are more expensive than nickel-cadmium batteries. They have lower self-discharge and memory effect and larger number charging cycles than NiCd cells. But they are afraid of low temperatures and, when discharged, also lose their characteristics.

The most expensive are lithium-ion batteries, which, compared to the first two types, have noticeable advantages:

Among the disadvantages of batteries of this type, their short service life should be noted. After three years, lithium begins to decompose and the battery loses its capacity beyond recovery.

Typical screwdriver battery malfunctions

Despite the fact that the screwdrivers are equipped different types batteries, they all have the same design and similar faults. The most common failures of this device are:

• loss of capacity of one or more batteries;
• mechanical damage battery pack circuits (tearing off the plates connecting the banks to each other or to the terminals);
• drying out of the electrolyte;
• Lithium decomposition in Li-Ion cells.

Loss of battery capacity is the most common defect in screwdriver batteries. Its essence is that the loss of the charge capacity of at least one battery does not make it possible to fully charge the remaining banks. When receiving a low-quality charge, the battery quickly discharges.

Such a malfunction may be a consequence of the memory effect or drying out of the electrolyte in the banks due to their heating during charging or under load. This defect in batteries of any type can be eliminated independently, without contacting service center. In this case, you can try to restore faulty elements or replace them. It will not be possible to restore only lithium-ion batteries that have lost capacity as a result of lithium decomposition. Such banks can only be replaced with new ones removed from a non-functioning battery pack.

A screwdriver battery malfunction can be caused by loss of capacity of one or more batteries, so it can be easily eliminated by replacing them with new ones or ones that are known to work.

DIY screwdriver battery repair

Most defects in the battery pack of a screwdriver can be eliminated yourself if you know the cause of the malfunction and how to deal with it.

Diagnostics of screwdriver battery faults

Before you begin repairing the battery, you need to diagnose it and identify the cause of the malfunction. To do this you need:

Video: how to completely discharge a screwdriver battery

Having found faulty batteries, you need to decide on how to repair them. There are two possible options here. The first is to revive defective batteries by flashing them with a current at a higher voltage or adding distilled water to jars if the electrolyte dries out. But these measures are temporary; in the future, the malfunction may appear again. Another repair method that is more effective is to replace defective batteries with new or used ones that are known to be good.

Video: searching for defective batteries in a screwdriver battery

Battery recovery

Restoring the lost capacity of a battery is possible only for batteries with a memory effect. These are nickel-cadmium and nickel-metal hydride batteries. To do this, you will need a more powerful charger with adjustable voltage and current settings. Having set the voltage to about 4 V and the current to 200 mA, we apply this current to the batteries in which the maximum voltage drop is detected.

You can try to restore defective batteries by compressing or compacting them. This procedure is a dilution of the electrolyte, the volume of which in the battery bank has decreased. To do this you need:

The procedure described in paragraph 5 can, under certain conditions, restore the functionality of the battery if the cause of its malfunction is the memory effect.

Video: the process of restoring the capacity of screwdriver batteries

Replacing batteries

The most in an effective way Repairing a screwdriver battery involves replacing a defective battery. To do this, you can use a new battery, which can easily be found on sale today, or remove a working jar from a non-functioning battery pack. Replacement work must be carried out in the following sequence:

It is important not to overheat the can when performing soldering work. Therefore, you cannot keep the soldering iron tip on the battery for too long.

Repair of battery packs with lithium-ion type banks is carried out in the same way. The only thing that complicates the repair task is disconnecting the batteries from the control board. In this case, only one repair method is applicable - replacing the defective can.

Video: how to properly solder screwdriver battery banks

How to convert a screwdriver battery to lithium-ion batteries

Often, owners of screwdrivers with nickel-cadmium batteries want to convert their batteries to lithium-ion batteries. They are attracted by the advantages that can be acquired by such a modification of the battery pack:

• Lighten the weight of the screwdriver, the operation of which will require fewer batteries at the same battery capacity and voltage;
• get rid of the memory effect, which is not present in lithium-ion batteries;
• reduce battery charging time.

In addition, with a certain assembly scheme, you can double the charge capacity, and therefore the operating time of the screwdriver on a single charge. The advantages, of course, are obvious, but this solution also has its disadvantages, which you also need to know in order to weigh the pros and cons. Among the negative aspects of adapting a screwdriver battery to lithium-ion banks, the following should be noted:

• higher cost of lithium-ion batteries;
• the need to maintain the charge level of the element strictly within the range from 2.7 to 4.2 V, for which it will be necessary to additionally install a charge-discharge controller board in the battery box;
• large sizes of Li-Ion batteries, which will require ingenuity and imagination to place them in the screwdriver battery case;
• it is impossible to use the tool with such batteries in low temperatures.

But if the decision to replace nickel-cadmium batteries is still made, then you need to proceed in the following sequence:

It may turn out that the assembled structure cannot be charged from the old charger. Then you need to install an additional connector for a new charge.

Video: replacing nickel-cadmium batteries with lithium-ion ones

How to properly store screwdriver batteries

In order for the screwdriver battery to last as long as possible, it must be stored correctly, especially when it is not used very often and with long breaks. In this case, you need to follow some rules.

Cadmium-based battery packs have a memory effect, which reduces the battery capacity when the charge is incomplete. Therefore, batteries with NiCd and NiMh batteries should be stored in a discharged state, and devices with lithium-ion batteries should be charged to half the capacity of the cans. This level can be achieved in approximately 65–70% of the normal full charge time.

If the battery pack of your screwdriver begins to discharge quickly and does not hold a charge at all, do not rush to throw it away and buy a new one. Its service life can be easily extended using the recommendations outlined above. This will save you from extra costs, because the battery of a screwdriver costs more than half the cost of the entire tool.

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Almost every battery in a power tool is the most expensive part. A screwdriver is no exception, because a replaceable battery can account for 30% of the total cost of the tool. After the device is discharged, you need to purchase a new screwdriver, but to save money there is another option - restoration, which will extend its service life.

The battery on the screwdriver runs out quickly

The problem with rapid self-discharge of the battery is quite common. It consists of fast charging, which occurs in about 20 minutes and the same short operation.

This situation may result from malfunction of the temperature sensor located in the removable battery. This temperature sensor may not be installed this way initially. It must be returned to the place of purchase.

If the battery begins to discharge quickly after prolonged uninterrupted use, which could happen after a fall, you need to get it repaired.

Battery won't charge

A screwdriver sometimes fails after prolonged use. Its working element may stop charging, which will lead to the impossibility of fulfilling the functional capabilities of the tool; the tool, roughly speaking, will “die”.

In order to extend the life of the instrument so that you do not have to remove it from visibility, you can try three methods in turn. Each subsequent one is considered more complex and costly. They are:

• restoration and increase in capacity after its reversible loss (memory effect);
• adding distilled water to the electrolyte;
• replacing some or all of the battery packs.

Battery life for screwdriver

The battery can last about three to four years if used and stored properly. In practice, this period is sometimes reduced to two years. It is very expensive to constantly change a tool, so it is better to choose right away best option for one purpose or another.

There are 3 different types batteries:

1. Nickel-cadmium. The most affordable, but short-lived, especially when frequent work in cold weather conditions.
2. Nickel metal hydride. A small device that does not have a long service life.
3. Lithium-ion. The most popular ones are capable of not being discharged for a long time, but have a higher cost than the above options.

Regardless of the type of battery, their lifespan depends on the number of charges used and storage methods. That is, the more the tool works, the faster it discharges. At the same time, “downtime” in use negatively affects the service life, especially if you store the tool in a condition where it is worn out.

How to restore a screwdriver battery at home

Is it possible to reanimate all types of batteries? Nickel-cadmium blocks, which are found in almost all modern screwdrivers, are easier to repair.

The restoration process requires an understanding of the basics of electricity. That is, have school knowledge about the operation of rechargeable batteries.

For work you will need tools and materials:

• screwdriver;
• tester;
• soldering iron;
• tin (with low-corrosive flux).

To resuscitate the battery, a donor will be required. It may be included with the screwdriver, or you may need to find it yourself, for example, by removing it from another old device.

To begin the operation, it is necessary to fully charge (about 6 hours) both batteries and swing it. After this, remove the plastic cover from the restored part using a screwdriver. This procedure must be performed carefully so as not to damage the fasteners. Otherwise, subsequent assembly will require glue, like Moment.

Refurbishment of nickel-cadmium batteries for screwdrivers

The ni cd battery device is manufactured using the same technology, so any battery can be made a donor of this type.

Such devices are separate components - blocks, with a nominal voltage of 1.2 V and an energy capacity of 1200–1500 MA/h. They are found in screwdrivers from the Interskol company. Each block affects the power, that is, if its value is 12 V, the number of blocks is 10, 14.4 V - 12, etc. After changing the battery, the power may drop for the first time of operation, but then everything will be restored.

Restoring an 18 volt screwdriver battery

18 V is a common power, which corresponds to the presence of 15 blocks. As a donor, you need to choose an electrical device with a voltage of 14.5 V, that is, a 12 V car battery will not work.

How to restore and start a lithium-ion battery

For these types of batteries, you will need to remember where the positive, negative and charging contacts are located. The voltage control board located on the batteries most often fails, or rather, their stabilizers and protective diodes.

The voltage at the battery output is checked, if the value is significantly less than normal, resuscitation is performed.

Second life of batteries in Bosch, Hitachi, Makita screwdrivers

The brands shown come with a lithium-ion battery. To revive them, you will need a soldering iron and sleight of hand, because if you do everything slowly, the service life may decrease, or the battery will completely explode.

All broken or frayed wiring inside the battery must be insulated, for example, with electrical tape or replaced with new ones in advance.

To restore, the torn parts are soldered metal elements- tapes that can be taken from old blocks.

To assemble, you need to return the cardboard spacer between the blocks and the board to its place. This will be required to prevent short circuits. Then the contacts are isolated.

A process such as restoring a screwdriver battery requires a certain amount of knowledge. How to resuscitate this tool, how not to make a mistake and not damage the battery and the screwdriver as a whole—many people ask these questions. Let's look at them.

A screwdriver is a special hand tool that is used for tightening and unscrewing bolts, screws, nuts, self-tapping screws and screws. Also, a similar device is used for high-quality and fast drilling of holes and for the thread cutting process. For modern craftsmen, the tool replaces a conventional screwdriver, but saves a lot of time.

The tool is simply irreplaceable in a variety of construction processes, including repair work Oh. If you need to assemble furniture, you can't do without a screwdriver. Every master who has worked with a screwdriver for a long time, after using a screwdriver, understands how much more time is saved. The versatility of the tool and its functionality are becoming increasingly greater.

The modern market offers a wide variety of models, but regardless of the brand, the batteries have an identical structure. If you disassemble the battery, you can see that it is assembled from relatively small structural elements assembled strictly sequentially.

The special typesetting parts present in the composition have standard sizes and voltage level. Only the capacity, which is measured in A/h and is indicated strictly on the element itself, can differ.

The housing has four contacts. Among them, the following can be noted:

Two power ones, for discharge and charge;
Upper control, which is connected via a special thermal sensor. Such a device is necessary to effectively protect the battery; it also turns off and specially limits the charging current by raising the temperature to certain levels. The heating process is carried out due to sufficiently large currents when carrying out a forced charge, that is, a special “fast” charge is carried out;
You can note the presence of a so-called “service” contact, which is connected through a special resistance. It is used for rather complex charging stations, which are designed to equalize the charge of all battery elements without exception. It is worth noting that such stations are not needed in everyday life, since the cost is high.

During operation, the tool may fail. When such a situation occurs, it is necessary to be able to determine the malfunction. All present elements cannot fail at the same time, since their circuit is strictly consistent. When one part fails, the entire chain fails. It is for this reason that it is important to identify that very weak point.

Approximately 70% of the total cost of a brand new screwdriver comes from the battery, which is usually included.

Typically, the battery of this tool fails after a certain period of use. In such a situation, you will have to purchase a completely new one. battery or produce high-quality repairs screwdriver, saving a significant amount of material resources.

What repair tools are needed?

To repair a screwdriver battery with your own hands, you should have the following tools with you:

Ammeter 2 A;
tester;
voltmeter for 2 and 15 V;
ohmmeter;
milliammeter;
screwdriver for opening the case;
magnifying glass;
scissors;
pliers.

Repairing such a tool generally consists of searching for and then replacing a faulty one. battery cell. To achieve this goal, it is important to know the order and sequence of the check, and you will also need to analyze the parameters.

Features of repair technology

Often during the repair process it is necessary to use technologies for the complete restoration of terminals and capacity restoration. Often a breakdown is indicated by the fact that the screwdriver battery does not charge. There are many reasons for this:

Malfunction of the included charger;
The reason may be a severely worn battery;
There is a violation of strong contact between the installed terminals.

If signs of failure appear, the battery must be repaired immediately. The exact cause of battery failure can be determined by measuring the voltage level with a special tester. Each battery needs to be checked in a similar manner. All faulty batteries found during the inspection must be marked and separated from those that are working properly.

If the battery is draining quickly, before you immediately disassemble it and change anything in it, first try to restore the battery capacity through several cycles of deep discharge and full charging. In 7 out of 10 cases, this helps restore battery capacity.

Often the cause of the breakdown is a faulty terminal. During the use of the device, they unbend, which entails poor contact; accordingly, the battery will be charged every other time. To carry out repairs, you must first disassemble the charger, carefully bend all the terminals, and then simply control the charging process using special devices.

If during the operation of this device its capacity is lost, and a series of successive charging and discharging did not help, then it is worth replacing this element, which is important for operation.

Below are videos, it is better to see once what to do with a broken battery than to listen or read, the first one shows disassembling the battery case, the second video already shows the process of restoring the battery.

Capacity recovery method

Often the battery needs to be restored to its capacity. This volume is usually lost due to memory effect erasure. Identifying this problem is quite simple. Once the battery is fully charged, it usually discharges very quickly and begins to function again only after a certain period of time. Fixing a problem like this is quite simple. Just follow the following instructions:

1. A small current is required to fully charge the battery.
2. After this, completely discharge it, using a small degree of load. In this way, it is possible to ensure a slow, that is, relatively soft discharge, which will allow the outer layer and the entire plate to sag.
3. For a load of this type, it is better to use a standard lamp, the voltage of which is 220 V and the power parameters are 60 V.
4. Discharge is required to approximately 30% of the total rated capacity, that is, up to 5 V.

Before using the screwdriver battery, it is advisable to repeat this procedure up to 5 times. Although the capacity of a refurbished device will be slightly lower than that of a new one, as a temporary measure, this method quite successful. Such manipulations can extend the operating time of a screwdriver by about a year.

And in this video we'll show you how to reassemble the batteries, how to make one working one out of 2.

Various alternative solutions to the issue

There are a few alternative options complete restoration of the battery. Among them, the following methods are very popular:

1. Gentle compression and slight deformation of the body. In other words, you can do what you did with the battery before, that is, compress it a little with light blows.
2. You can carry out the following process - charge the batteries strongly with a stronger current. After this, they are completely discharged and charged again. Typically, such shock therapy gives a fairly good result, that is, it is able to bring back to life batteries that previously seemed hopeless.

If, through the use of certain mechanical influences functionality cannot be restored and will need to be replaced.

The nuances of self-repair

Repairing the battery of a tool such as a screwdriver with your own hands can be done by replacing all existing faulty parts. When purchasing a new element, you must carefully ensure that the dimensions and capacity completely coincide with all the original components. If a faulty component is found, it will need to be cut off and then a new one soldered in its place.

Speaking about the important points and nuances of this process, the following factors can be noted:

When using a soldering iron, you need to work quickly so that the battery does not heat up;
The joining process must be done using plates;
It is worth constantly remembering that the connection of all elements is carried out strictly sequentially.

After basic repair work, the battery potentials may be completely different. Therefore, they need to be aligned. For this purpose, you will need to charge the battery for 12 hours, then let it cool for a day. A device for measuring the voltage present should show the same parameters of 1.3 V on all components without exception. It is recommended to do this several times.

Restoring a screwdriver yourself will save you money material resources in the workshop and without the need to purchase a new tool. To achieve an ideal high-quality result, it is enough to follow the rules and instructions outlined above.

This video shows disassembling the battery