How to repair a screwdriver battery. Battery gas release

How to repair the battery of a screwdriver

If one or more (or all) elements cannot be restored, you will have to resort to the battery of the battery. This procedure is a replacement of faulty cans. In some cases, it is rational to fully collect the battery from elements of a different type.

With partial replacement, all types of batteries are afraid of overheating, which can occur during soldering (especially, inept). But for Li-Ion elements, overheating can be critical-inside the housings, in addition to chemicals, there are safety devices (a valve for the power of excess pressure, etc.D.), made mostly, from plastic. If they are damaged under the influence of elevated temperature, further operation will be dangerous. Therefore, for replacement, you need to take batteries with already installed connecting tires.

Li-Ion battery with connecting tires.

It is even better to purchase ready.Made battery assemblies. In this case, the soldering process is completely excluded.

Complete or partial replacement of nutrition elements

Reviewed elements must be removed from the battery, cutting the connecting tires. Instead, you need to purchase new banks. If the replacement is partial, then elements of the same type and the same container are bought, otherwise there will be problems with charging. Newly installed elements will always be either unapitized or rechargeable compared to other banks.

In case of full replacement, it is possible to modernize the battery-install elements of a different type or increased capacity (due to the improvement of technologies, it may turn out that this will not lead to an increase in the dimensions). If a decision has been made to install cans of a different type, more rationally apply lithium-ion batteries.

Alteration for lithium-ion sources

If a decision has been made on the complete replacement of the battery, rationally consider the option of using lithium-ion batteries instead of outdated nicd or nimh. The battery can be made up of widespread LI-ion elements of size 18650. They are performed in the form of cylinders with a height of 65 mm and a diameter of 18 mm (banks equipped with protection board have a slightly larger length). This solution is optimal for screwdrivers, which are often used and work in conditions of positive temperatures.

Nominal voltage of one lithium element. 3.7 volts. The number of cans in the battery is determined by the working voltage of the screwdriver. So, for a 12-volt tool, 3 lithium-ion batteries will be required. If we take more cans, then the voltage will increase. This will lead to an increase in torque and to a decrease in the resource of the electromechanical part.

You can try to install the elements in the standard battery case, having previously removed the old batteries and unnecessary fastening elements.

Removing the mounting elements from the regular battery body using a milling cutter.

If this is not possible, you can make a new case. The installation of a balancer board is required. It will not let separate cells recharge. When selecting the case, it is necessary to provide a place for this device.

Step.By.Step instructions for remaking in a separate article: how to transfer a screwdriver to lithium batteries

To consolidate information, we recommend that you familiarize yourself with the methods from the video.

It should be understood that even if the battery was revived, its resource will be limited and it does not work long. Therefore, the restoration of faulty batteries of the screwdriver should be considered a temporary measure (except for the case of a complete replacement of the battles), and after even a successful procedure it is better to purchase a new battery.

Varieties of battery for screwdriver

Almost all modern models of screwdriver have the same battery block device. Elements consistently connected to a single chain. Form, dimensions and denominations always the same. In total, they create the final voltage of the device. The difference between them is observed only in the container. This thoroughly allows you to easily stick and replace such batteries.

As a rule, 3 main varieties of batteries are used:

The face value of each block is 1.2 volts. Their main advantages are expressed as follows:

  • Accessibility in view of prevalence and low price.
  • Resistance to the negative value of environmental temperature.
  • Preservation of characteristics during storage in a discharged state.

Disadvantages are manifested in small capacity, as well as such a number of factors as:

In addition, due to the toxicity of the production cycle, manufacturers of the 3rd world countries produce this type of battery, which in itself can manifest in factory marriage and low quality.

The batteries of this modification supply voltage of 1.2 V. Many people prefer them as an alternative to failed blocks when it is necessary to repair the battery for a screwdriver. This is primarily explained by high quality, since the production line does not provide environmental pollution, and therefore well.Known manufacturers are widely used in developed countries.

In addition, they are distinguished by the following merits:

  • The minimum memory effect.
  • Low self.Discharge coefficient.
  • Higher capacity. In comparison with the above variety.
  • The maximum operating range of cycles “Charging-discharge”.

The disadvantages are manifested in high cost, the impossibility of exploitation at low temperatures and the deterioration of characteristics during prolonged storage in a discharged form.

The batteries of this variety give out a face value of 3.6 in. The main advantages are manifested as follows:

  • Big container.
  • A few times larger range of working cycles. Compared to other modifications.
  • Lack of memory effect.
  • Minor self.Discharge.
  • The possibility of reducing the weight of the battery block. Due to the need to use smaller cans in the chain due to their greater potential and capacity.

The disadvantages are expressed by the maximum price and limited expiration date. After 3 years, the batteries are lost most of the container due to the chemical decay of the filler.

Determination of breakdowns

In case of damage to part of the elements that make up the bank, there is a loss of voltage and capacity. The owner of the equipment needs to purchase a new part or repair the standard device. Before the restoration starts, the product is diagnosed, which allows you to determine the malfunctions.


The voltage of the sections of a obviously serviceable battery bank is the same, the parameter depends on the type of elements. For example, for a single section of the nickel-cadmium type, the standard voltage is 1.2 V, for the lithium-ion battery-3.6 V for. Before starting testing by a multimeter, the banks are charged with a regular device (in compliance with the recommendations of the manufacturer of the tool).

To further check the power source with a voltage of 18 volts, Makita is necessary for a screwdriver:

  • Disassemble the bank and measure in each section (in total, 15 standard elements are provided in the design). A serial number or value of the measured parameter is applied to the cases of parts.
  • Set the lid in the regular place. The bank is attached to the instrument handle (on contact platforms).
  • Discard the battery using an electric tool engine until the performance is reduced.
  • Dismantle and disassemble the jar, and then carry out a repeated voltage measurement. Sections on which it decreased to 0.7 V are subject to replacement or restoration (in the case of a nickel-cadmium base).

Checking the load

Load testing involves the use of a 12-volt car lamp equipped with a cartridge and connecting cables. Check allows you to determine damaged jumpers. In the design of the banks, spring terminals were used, which during operation lose their elasticity and do not provide full charging.

To restore the nodes, it is necessary to disassemble the body of the part, and then remove the contacts. Elements are bent and installed in a regular place, if the repair has failed, then the terminal is required.

The load fork for testing the tool accumulators is used in the conditions of service centers. The product allows you to imitate the operation of the electric motor under load. The intensity of the voltage drop determines the condition of the battery.

How to eliminate memory effect

When the battery very often experiences insufficient charging and subsequent discharge, it has the so.Called memory effect. That is, the battery gradually remembers the minimum border of charging and discharge, as a result, its capacity is not fully used and also gradually decreases.

This problem is mainly characteristic of nickel-cadmium batteries and to a lesser extent affects nickel-metallhydridge. In any case, it is required to restore the battery capacity. The memory effect does not at all concern lithium-ion batteries. In order to solve the problem, whether it is possible to repair the element, it is recommended to perform full discharge and charging the battery using a 12 volt light bulb. A plus and minus wires are soldered to it, which are connected to the contacts of the battery. This procedure is repeated five times or more.

repair, screwdriver, battery, release


How to repair the nickel-cadmium battery of a screwdriver

The specificity of nickel-cadmium cans is that at the end of the service life, the contents of their electrolyte may dry out. In this case, sometimes reloading with distilled water helps. Read about the restoration of the screwdriver of the screwdriver with this and other ways here →

But if you think about what is better and obviously more effective, you should still decide to replace the batteries of the screwdriver. Filling does not always help. The likelihood that the tool will work well with the battery, in which a partial replacement of the cans will be well, is much higher. Of course, provided that everything is done correctly.

Finally, the filling process, in itself, is no less laborious than the process of repairing batteries. And if it turns out to be ineffective due to the fact that the battery is simply dried up, it will be very annoying.

We disassemble the block and look for the “weak link”

Before starting the repair of the screwdriver battery with your own hands, it should be borne in mind that the battery block itself should be opened as accurately as possible. Sometimes a lot of patience is required for this, because the manufacturers of blocks always strive to make it so that it was as difficult as possible to get to the batteries. This is understandable. Most manufacturers are interested in the fact that the masters do not repair the screwdriver battery on their own and do not bother with the banks, but, without hesitation, acquired a new tool, often at a fairly large price.

After opening the battery, all batteries should be removed from its plastic case. An important point: Do not forget to pre.Charge the battery before this manipulation. You can charge no more than three hours. Then, after the seizure of the cans, it will be necessary to use the multimeter to measure voltage indicators on each of them.

Next, follow this algorithm of action:

  • After measuring the U each of the cans, write down the results. Most likely, elements with the least voltage indicator and then have to clean.
  • Now discharge the battery bunch. You can connect the load in the form of a light bulb to it.
  • Repeat the charging process again. Measure the voltage on each battery and Saving those who have the weakest indicators.

Of course, before replacing the batteries in a screwdriver, you should purchase new elements similar to the old one, preferably with a small margin. Buy batteries with the same capacity indicator.

We install new banks

Before installing new batteries in the battery, it is important to take into account certain subtleties, without which everything will be impossible to do correctly. Primarily, It is important to remember the observance of polarity during soldering. And also understand the difference between the usual soldering and the principle of spot welding. Because the plates connecting the nutrition elements among themselves are not recommended to solder.

If you do not have a device for point welding, try using an ordinary soldering iron. But everything should be done clearly, neatly and as quickly as possible. The main thing is to prevent a critical overheating of the batteries. Use only high.Quality lead solder.

By the way, it is in such cases that one of the main advantages of nickel-cadmium batteries is manifested. Passing a certain risk during the repair, they have a fairly great chance of “surviving” before high temperatures due to a strong metal case and a composition that does not have increased explosion hazard. Lithium elements are much less rack for “stitching” and more capricious.

Repair/Revive/Recondition cordless tool batteries

Put each battery in the sequence that was observed in the old conjunction, and collect the battery block again. After the battery is assembled again, it is necessary to “swing” it, as it should, in order to balance the potential of all elements and remove what is called the “memory effect”. Spend the new battery, at least two or three cycles of “charge-discharge”. As you know, nickel-cadmium batteries are not recommended to constantly “recharge” without preliminary full discharge, which in the process is not always possible.

In the future, during the operation of a repaired battery it is necessary from time to time to completely discharge it with subsequent complete charging. To prevent the frequent occurrence of the “memory effect”. This is recommended to do at least once every six months. So you can extend the life of nickel-cadmium elements with the optimal development of their resources, without the accumulation of unnecessary information about previous recharges.

Simple recovery: replacing several elements

If operations with distilled water and the “reflashing” of nickel-cadmium batteries require time and dexterity, then only a multimeter, soldering iron and new battery banks will need to replace their elements to replace their elements.

Before replacement, it is necessary to diagnose the battery and how to do this correctly described above. The battery consists of individual elements that need to fall out. Low.Power soldiers are used for soldering, otherwise the power sources can be damaged by high temperature. Low voltage elements should be set aside or mark.

After determining the faulty power sources, they should simply be replaced with new ones, which are soldered again in a common battery. The cost of individual cans is much lower than the entire design, so the savings will be evident. After all the elements are assembled in the battery, it is necessary to carry out several cycles of the charge/discharge of the battery.

How is the battery for a screwdriver?

And everything turned out to be just to banality. The case neatly lay 15 batteries wrapped in paper isolation, soldered with each other with point welding. The number of batteries pleased me, because I know for sure that if in the finger battery 1.5 volts, then in the same accurate battery only 1.2 volts, which means the batteries are quite standard. In addition to barrels, I discovered a part of a strange look and incomprehensible purpose. On the details there is a marking: D7ab 17 AM026A5-540. You can find this marking on the Internet, but what is it. I did not find. And another detail was. She looked likely so. Just like a piece of wire, but the fact that it was glued to one of the barrels of white paste made me suspect that this detail was the termistor. I took the multimeter, put it to measure the resistance and connected the device. Then he began to heat. The resistance began to quickly decrease. Thus, it really turned out to be thermistor.

Why the battery for a screwdriver needed a termistor? And very simple. It seems that a professional and very high.Quality device is sharpened on a super fast charge. With such a quick charge, batteries can overheat, and a Smart charger does not allow this, either limiting the charging current, or turning it off at all.

Screwdriver battery: design and views

Despite the external design differences in the batteries of screwdrivers, inside these devices have the same structure. Each device is based on a set of small cylindrical elements that are interconnected by a sequential way. Such elements are called “banks”, the external image of which is shown below.

Such “banks” are made of various materials, which is reflected in the cost of a screwdriver. These materials include:

  • Nickel-metall-gidrid (ni-mh) elements. The rated voltage of each can does not exceed 1.2 volts. The final nominal value of the voltage of the battery depends on the number of such cans.
  • Lithium-ionic. The voltage of each can is 3.6 volts, therefore, to achieve a similar face value with metal-hydride, it takes 2 times less cans.

It is rarely possible to find another type of battery for screwdrivers that have an abbreviation NI. CD. This means that nickel.Cadmium banks are installed in this device. They are already almost replaced from the market by more modern and better types of batteries in characteristics. The most popular are lithium batteries currently. The main advantage of lithium devices is the lack of self.Discharge, lower weight, as well as a large number of cycles for charge and charge. Such advantages are reflected in the cost of products, the price of which exceeds 3 times nickel-metal-hydride.

An example of a replacement of the Ni-CD battery with Li-Ion in a screwdriver

Examples of replacing a nickel battery with lithium-ion can be found on the Internet. For work, use a soldering iron, thermocles and other tools.

It is important to observe all the necessary sequences so as not to break the work of the product. With a neat and careful approach, even at home, you can replace one elements with others.

It is not difficult to replace the batteries in a screwdriver, any man at least slightly disassembled in electricity will cope with work.

How to properly repair batteries for screwdrivers?

How to repair a screwdriver for a screwdriver is a frequently asked question among home masters, because this device has almost every owner in the arsenal. The main advantages of the tool functioning from the battery consider compactness, the ability to work with it even at altitude (due to the lack of power supply). Nevertheless, the battery of this device may fail, and purchase a new one. Is unprofitable, because its price sometimes reaches 60% of the cost of the tool. Therefore, it is recommended to try to restore the battery. How exactly, we will tell you today.

What does the screwdriver battery look like?

Despite the variety of models of these tools, the battery has a similar appearance in all screwdrivers. It is a plastic box, where there are many components of nutrition. They are fixed with each other in a single chain so that the wiring of the “banks” on both sides is closed to contacts, which provide power to the screwdriver.

All batteries have a primitive structure, which even an inexperienced master can figure out a little familiar with electrical engineering. In addition to power parts in the box of the unit, it is often located:

  • Thermoresistor. Allows you to control the temperature of the cans during charging;
  • Thermal switch. Automatically blows out parts of the circuit in case of battery overheating;
  • Control and control payment (only for lithium-ion batteries).

Varieties of batteries

Table 1. Common types of battery.

The controller allows you to open the battery circuit if necessary, even in cases where it is not in the screwdriver case.

Malfunctions in the work of a screwdriver

Despite the variety of power sources for the battery, they all have a similar structure, which means they are the same: they have the same:

repair, screwdriver, battery, release
  • Gap of the chain connecting jars;
  • Loss of charge capacity (one or more);
  • Evaporation of electrolyte;
  • Lithium decomposition (only in some batteries).

Reducing the capacity of battery elements is a common problem that happens even with a short use of the device. The problem is due to the fact that even when a single charge loses the container, the rest of the banks can no longer fully charge. As a result, the time of continuous use of a screwdriver is reduced.

The reason for such a breakdown is the “memory effect” or the evaporation of the electrolyte in the nutrition elements, which occurs when they are severely heated. Nevertheless, even such troubles can be handled at home without addressing specialists.

Non.Working elements are restored or replaced with new. The second case is relevant for lithium-ion battery, in which lithium decomposition occurred-in this case it remains only to buy a new power source.

Repair of the screwdriver battery

Almost any breakdown of the screwdriver battery can be fixed on your own. This will need to know the cause of the malfunction and ways to eliminate it.

Detailed diagnostics of the battery: step.By.Step instructions

Step one: It is necessary to charge the power source 100%. If we are talking about a nickel cadmium battery, then it is first discharged to zero to avoid the “memory effect”.

Step two: Next, you need to remove the lid of the plastic block. It is much easier to do this if it is screwed with screws. They will have to be unscrewed. Nevertheless, often this lid is fixed on glue, so you need to take the stationery knife and carefully walk along the seam, after which it will turn out to be easily disconnected by the screwdriver.

Step Three: Now it is necessary to carefully consider the condition of the internal elements, to identify damage: violation of the integrity of the chain, flowing electrolyte and so on.

Step fourth: Next, you should measure the voltage level of each jar with an as an avometer. For nickel-cadmium and nickel-metallogid sources, there should be a voltage of about 1.3 V. For lithium-ion cans, the charge is-3.7 in. It is recommended to sign the voltage level of each battery so as not to confuse them.

Step Five: Now it is necessary to make a load for the battery, attaching a small bulb to outputs. In this form, the jar should be held for a while, and then measure the voltage again. Then it will be possible to identify the link with high drawing.

What you need to know before starting repair of the screwdriver battery

Before you try to restore the battery at home, you must familiarize yourself with the main recommendations:

  • Before starting repair work, it is necessary to determine the type of battery used;
  • In the process of disassembling the battery case, it is necessary to find out the polarity of the joints;
  • All “banks” installed in batteries to protect against overheating are equipped with a soldered resistor and therefore must be removed very carefully;
  • It is impossible to fix lithium-ion batteries.

Structural elements of a screwdriver

People who have decided to repair the power tool should familiarize themselves with its main constructive elements:

  • Electrical engine;
  • Planetary type gearbox for transmitting rotation from engine to spindle;
  • A coupling that regulates the torque;
  • Electronic control unit;
  • Battery;
  • Clamping cartridge with which work nozzles are fixed.

If you use a screwdriver, each of the listed components may fail.

Restoration of the screwdriver battery. Squad battery repairs. Replacement and restoration how to change batteries in a screwdriver

I think that everyone is already familiar with this problem, when one day you take your screwdriver, turn it on, and it does not work. Further, first of all, you are trying to put it on charging, suggesting that the batteries simply discharged. But it wasn’t there: charging does not bring results. This problem is old as the world. The thing is that inexpensive screwdrivers us relatively cheap nickel-cadmium (nicd) batteries. They are pretty whimsical and, with undivided operation, their formation immediately comes out.I suggest you restore your screwdriver so that it is like new. For this, we will simply replace batteries with similar or better quality.Although on the Internet, most people recommend changing batteries to lithium-ion (Li-Ion), but I am not a supporter of a complete alteration. After all, you can’t just replace them, due to the fact that lithium-ion batteries need to be charged differently, introduce a charging controller, use another power source, etc. P. And the body of the batteries themselves will undergo significant changes. No, I just recommend changing the battery to the same, it is much cheaper and you do not need to fence anything and invent anything.

You will need it

As you can see, are quite acceptable. Look for your size and quantity. I ordered 12 pcs. The total voltage of the former block is 14.4 in. Some element. 1.2 V. Simple mathematics 1.2 x 12 = 14.4 V.

Restore the battery of a screwdriver

Well, now we move directly to the restoration of a screwdriver. Remove the top cover of the battery block.

Count your number of elements. It will not be superfluous to write off the brand of batteries used.

In order not to forget how the batteries inside are placed, I made a kind of card on paper with their location and poles. Do the same thing, so that later you do not puzzle and think where it goes.

Now you can disassemble this bunch to free the nutrition terminals, which are just then needed.

To connect the elements, I took a shielding wire from the old USB cable.

We collect a chain. We solder the batteries with these segments, according to a previously drawn scheme.

In general, closed.Type batteries do not solder. Jumper must be welded with contact welding. But since it is not available, take a powerful soldering iron and quickly solder it.

We smear the pole with the flux, put the jumper and solder the quickly hot soldering iron, holding the sting for no more than 1-2 seconds.

At the end, glue the general insulating gaskets on both sides and collect the block in the reverse sequence. We measure the voltage on the weekend terminals. It should be in the region of 14.4th century. If so, then the battery inclusion sequence is true. We set to charge.

So, simply, without unnecessary manipulations, you can return a screwdriver to work, which will last a very long time if you follow it properly.

The screwdriver is the necessary tool in the farm, but the time comes and its energy source comes. The battery stops working. The models are constantly changing and sometimes you can’t find the right battery. At the same time, you can completely restore it or extend the service life of 2-3 years. A real article tells how to repair the screwdriver battery.

Dismantling of the battery

When deciding whether it is possible to restore the screwdriver of the screwdriver, you must first figure out how to extract elements from it. The battery is placed in a plastic case of two halves. First you need to unscrew the connecting screws. If the connection is made with glue, you will have to tinker with a screwdriver or chisel. Should be disassembled carefully so that then you can seal the body again.

Inside are placed elements connected in series. In some designs, a parallel-sequence is used.

Replacing elements

When deciding on how to restore the screwdriver battery, it is necessary, first of all, to identify faulty banks that spoil his work. If the battery sat down, it must be charged, and then check the voltage on all elements. It should not differ from the nominal by no more than 10 %.

Repair lies in how to restore a screwdriver in general. It is affected by the serviceability of each element. He must have a given capacity, which is understood as the ability to feed the load connected to it. Sometimes it is better to replace failed elements that are quickly discharged. They can be detected by corrosion damage or the presence on the surface of characteristic traces of electrolyte.One or two elements can be a serious obstacle in the work of the entire line.

If the battery is used for more than 3 years, then most elements can be faulty. In this case, it is better to replace them all. It is important that they are suitable for voltage and size. The cost of batteries collected separately, lower than new assembly.

The serviceability of each can is checked by the size of the internal resistance, which should be about 0.06 Ohms. To do this, the load is connected to it (a resistor by 5-10 Ohms) and at the same time determine the current and voltage. It is convenient to use low.Voltage incandescent lamps. Measurements are made with two different resistances that make up 30 % and 70 % of the permissible load, respectively. From the 1st voltage, the 2nd is deducted, and from the 2nd current-the 1st. Then the subtraction results are divided and, in accordance with the OMA Law, we find the internal resistance of the battery.

The battery is often sold complete with a reserve. Of the two you can collect one and there will still be banks in stock. It is advisable to use them somewhere as power sources, for example, for a flashlight with a car lamp.

Whether any battery can be repaired

Interested in how to restore the battery of a screwdriver, the owners of the equipment forget about the type of batteries, built into it. The ion type is useless to reanimate. In most cases the question is related to the decomposition of lithium. Only occasionally the problem arises due to the malfunction of the control scheme.

How to Repair a weak Drill / Screwdriver / Battery runs out quickly

Specialists restore equipment:

The process is successful with power: ni-cd (nicd), ni-mh and li-ion.

Restoration of the battery of a screwdriver by acquiring new Ni-CD elements

In this case, we are talking about a complete replacement of battery elements and the so.Called “erasing the memory effect” from new batteries in order to ensure their more productive work. The memory effect lies in the fact that the battery “remembers” all possible charging cycles, which it theoretically can be subjected to work before you get into someone’s hands. The more in her “memory” of such cycles, the more likely it becomes that the capacity will begin to decrease much earlier than expected. Also, nickel-cadmium batteries love similar processes of “swing”. If they are carried out immediately before use, they will work much better.

The desired number of batteries can be ordered on the Internet, for example, on Ali-Express. It must be borne in mind that they already have a certain factory charge, which is desirable to “remove” in order to “save” the batteries during operation. You can do this using the same IMAX B6 charger, whose menu is easy to understand.

Suppose a screwdriver battery should consist of 10 elements with the following indicators: the output voltage of each is 1.2 V, and a capacity of 1200 mAh, which in the total amount is 12 V. The advantage of the complete replacement of the battery, followed by “erasing” the factory “memory effect” is that in any online store you can order elements with higher capacitance indicators than old. For example, 1800 mAh. And the battery will work an order of magnitude longer. Of course, such batteries will cost more. But their price always justifies itself.

At first, the voltage on each “bank” is checked by the multimeter. This will immediately help to determine what quality new batteries have and whether the dishonesty of sellers who could sell old elements instead of new ones. The voltage level on each battery should be approximately 1.3 V. When measuring it is important not to confuse terminals.

Further, “erasing memory” is carried out with each element alternately. The following charge parameters are exhibited on the charger: if the capacity is 1800 mum, it can be set a little more. 1900, a little with a margin. Then you should go into the charge mode of nickel-cadmium batteries. The charge parameters should be as follows: the current indicator is 0.9 A (half of the capacity of 1800).

Each new element is undergoing training on the principle of “charge-category” in order to remove factory parameters. At a current of 1A, all battery is alternately discharged to a voltage of 1 V (minimum allowable voltage so as not to kill the battery).

Then you should go to the “charge-category” cycle mode and start it with the “Start” button. After the discharge and removal of the factory memory, put the batteries back to the block, focusing on how old ones were previously laid there. Therefore, when disassembling the plastic case, you need to remember how the batteries lay earlier.

Thus, there are many ways to restore the battery of the screwdriver with your own hands. Each of them has certain nuances, disadvantages and advantages that should be taken into account depending on how you restore the capacity. Sometimes you should try to purchase a particular tool or the necessary ingredient (for example, distilled water) in order to restore as successfully as possible. But this is what will help you avoid additional expenses in connection with the acquisition of a new screwdriver or a fully finished battery.


The cost of a new screwdriver by about 70% consists of the cost of the battery to it. Therefore, it is not surprising when when we faced the failure of the battery, we ask ourselves the question. What’s next? Buy a new battery or screwdriver, or maybe it is possible to repair the battery of the screwdriver with your own hands and continue to work as a familiar tool?

In this article, which is conditionally divided into three parts, we will consider: the types of batteries that are used in screwdrivers (h (h.1), their possible causes of failure (h.2) and affordable repair methods (h.3).

  • Screwdriver battery: design and views
  • Determination of a malfunction
  • Is it possible to “reanimate” elements and how?
  • Repair and replacement of the elements of the screwdriver battery

Screwdriver battery: design and views

It should be noted that regardless of the brand of the screwdriver and the country of the manufacturer, the batteries have an identical structure. The collected battery block has this type.

If we analyze it, we will see that it is assembled from small elements that are collected sequentially. And from the school course of physics, we know that the elements that have a sequential connection are their potentials.

Test parts or “banks”, as a rule, have a standard size and voltage, they differ only in capacity. The battery capacity is measured in a/h and is indicated on the element (depicted below).

The following types of elements are used for layout of screwdriver batteries:

  • Nickel. Cadmium (Ni. CD) batteries, with a nominal voltage on “banks” 1.2V;
  • Nickel-metall-gidrid (ni-mh), voltage on elements-1.2V;
  • Lithium-ion (Li-Ion), with voltage-3.6V.

Let us consider in more detail the advantages and disadvantages of each type.

  • The most common species due to the low cost;
  • Low temperatures are not terrible, for example, like Li-Ion to batteries;
  • Stored in a discharged state, while retaining its characteristics.
  • It is produced only in the countries of the Third World, due to toxicity in production;
  • Memory effect;
  • Self.Discharge;
  • Small container;
  • A small number of cycles of charge/discharge, which means that they do not “live” for a long time with intensive use.
  • Environmentally friendly production, it is possible to purchase a high.Quality branded battery;
  • Low memory effect;
  • Low self.Discharge;
  • Large container, in comparison with NI. CD;
  • Cycles/discharge.
  • Price;
  • Loses part of the characteristics during prolonged storage in a discharged state;
  • At low temperatures, it does not “live” for a long time.
repair, screwdriver, battery, release
  • There is no memory effect;
  • There is almost no self.Discharge;
  • High battery capacity;
  • The number of cycles/category/discharge is many times larger than the previous types of batteries;
  • For a set of the required voltage, a smaller number of “cans” are necessary, which significantly reduces the weight and dimensions of the battery.
  • High price, almost 3 times in comparison with Nickel. Kadmiev;
  • Three years later there is a significant loss of capacity, t.To. Li decomposes.

We met with elements, move on to the rest of the elements of the battery block of a screwdriver. Dismantling of the block, for example, for repairing the Hitachi screwdriver battery (depicted below), is very simple. We unscrew the screws around the perimeter and disconnect the case.

  • Two power, “” and “-”, for charge/category;
  • Upper manager, it is turned on through a thermal sensor (termistor). Thermistor is necessary to protect the batteries, it disconnects or limits the charge current when the elements are exceeded (usually in the range of 50. 600C). Heating occurs due to large currents with an forced charge, the so.Called “fast” charging;
  • The so.Called “service” contact, which is enabled through the resistance 9kom. It is used for complex charging stations that level the charge on all elements of the battery. In everyday life, such stations are useless, due to their high cost.

Here is actually the whole design of the battery. Below is the video about how to disassemble the block.

Determination of a malfunction

We figured out the purpose of the structural structural elements, now we will consider how to determine the malfunction, this is.2 repairs of the screwdriver battery. We immediately note that all elements cannot fail at once, and since our chain is consistent, when one element is released, the whole chain does not work. So, our task is to determine where we have the weakest link in the chain.

To do this, we will need a multimeter, and for the second method of searching for a 12V lamp, if your battery on a screwdriver is also 12 voltage. The procedure is as follows:

Note. The difference between the elements in the battery of 0.5. 0.7v is considered significant, this means that the element becomes unusable.

Replacing all elements of the battery block

The right number of elements can be ordered in any online store, depending on the number of old batteries. It is important to pay attention to ensuring that all of them are originally the same capacity.

You can completely replace all the elements of the battery block with new nickel-cadmium batteries. They are much cheaper than nickel-metallhydrid, and, compared to other batteries, the most tenacious and hardy. However, recently, independent remodeling of “cadmium to lithium”, in other words, is increasingly practicing, instead of old Ni-CD new lithium-ion batteries.

Despite their reliability, nickel-cadmium batteries can quickly fail because they have a sequential connection to each other without a board of balancing. If the batteries of one batch of manufacture, their parameters will still have a large spread among themselves. With this connection, one element will be charged faster, the other is slower, and the third may be reloaded.

If manufacturers of cadmium batteries made balancing boards, as for lithium batteries, Ni-CD could work much longer. But manufacturers are simply unprofitable for manufacturers. As for lithium elements, balancing boards in such battery blocks are installed because without them overheating with the subsequent explosion: here manufacturers are simply nowhere to go. Which battery is better for a screwdriver, you can find out here →

To complete the replacement of batteries in a screwdriver from Nickel-Kadmievs to lithium-ionic, you will need:

  • The number of elements equal to the number of previous (with the same capacity);
  • Balancing board 5s (her ampezh depends on how much volts the screwdriver is designed);
  • Tester or multimeter ;
  • Soldering iron with a good “sting” ;
  • High.Quality flux and lead solder ;
  • Silicone wires Aug 16 ;
  • Heat.Resistant adhesive tape.

Before you start soldering, discharge batteries. Remove old batteries from the block and free contacts. It is better not to throw out the old thermal attenter, but to leave it as additional protection against overheating of lithium.

Now the main thing is to properly stock up lithium. Cut the wiring of the desired length in advance, isolated, in the silicone, very thick to avoid their melting during lithium heating. Knives are cleaned with batteries for rations.

Heat the soldering iron well, up to 300 ° C, and start the soldering with a flux and lead solder. The flux should be of good quality, indelible, not conducting current. In no case do not use acid fluxes. Singing no more than 2 seconds to avoid overheating of lithium. In order for the heat to go faster, you can put any iron object after soldering after soldering, taking the heat.

Let the batteries cool and combine the “pluses” with the “minuses”, as usual. Check the total voltage. Its indicator should be an average of 20.7 V if the elements are 15 pieces.

After measuring the voltage, the board is attached. All its wiring must be laid with special gaskets, so that nothing “shakes” during operation. The entire battery block is scooped up with heat.Resistant adhesive tape, designed specifically for the insulation of batteries and their contacts.

Wires and connector are soldered. If the contacts “hang out”, they can be planted on thermoclie. Now, finally, you can finally collect the battery block of the screwdriver and check its work.

Sometimes it seems that it is very difficult to repair the battery. But if you understand the general principles, such as the basics of electronics, the device of batteries from the inside, the types of batteries and the main principles of the correct soldering, it becomes clear how to repair the battery for a screwdriver on its own. This will not only save financial resources, but will also contribute to the acquisition of valuable and useful skills.