How to assemble a battery for an electric screwdriver. Restoration of nickel-cadmium batteries

How to replace banks in the battery of an electric screwdriver

As you know, any battery sooner or later develops its resource and needs either a partial replacement of the nutrition elements, or it should be completely changed. If we are talking about an electric screwdriver, it is much easier for someone to buy a new one than replacing batteries in it, because it requires time and a certain skill. However, in the presence of skills and the ability to replace the batteries in an electric screwdriver, it can be a good alternative to buying a new. In many cases, it costs cheaper.

As batteries in screwdrivers, nickel-cadmium or lithium-ion elements are usually used. Nickel-cadmium batteries are more unpretentious and, if a partial replacement of elements in such a block is carried out, it will work for a long time. Partial replacement of lithium batteries can also be carried out, but it is a little more complicated. It should be borne in mind that not only the elements themselves will have to solder, but also the balancing fee. Also, recently, electronics lovers often change the batteries of an electric screwdriver with their own hands, with nicd batteries for lithium. This is a good way out if the screwdriver has to work often and intensively. The capacity of lithium-ion battery is much higher, and the number of cycles is more.

List of necessary tools

The repair or diagnosis of the battery of the screwdriver is impossible without a specific tool and measuring devices. To restore the battery, it is not necessary to buy expensive tools, budget manufacturers are quite suitable.

List of the tool necessary for repairing the battery of a screwdriver:

  • Multimeter. A measuring device that allows you to determine the constant and alternating voltage, resistance, current strength or to call the circuit for a breakdown. Expensive models are able to measure the capacity of elements, but they will not be useful to the home master.
  • Flat and curly screwdrivers. An indispensable tool that will help out more than once in the future.
  • Montier knife with interchangeable blades.
  • Soldering iron. 40 watts will be quite enough. Powerful models are more expensive, and if handling them, you can damage the element.
  • Tin and solder. Inexpensive consumables.

Consumable materials, for example, island or heat.Estimated tube, household glue, small segments of wires are also useful.

Alteration of an electric screwdriver 12 /14 volts for lithium batteries

After a certain period of operation of the battery of an electric screwdriver will get tired and it will need to be replaced. At this moment, the instruction will come in handy how to remake an electric screwdriver for lithium batteries.

Replacing batteries in electric screwdriver with lithium 18650 does not require specific knowledge from the user, it is only necessary to understand the basics of the repair, as well as acquire the necessary components.

Important! The lithium-ion block has a low level of self-discharge, has a high energy density in calculation of the mass and at the same time pleases with its price tag.

When connecting to the batteries, a clear sequence must be observed: 0 in then 4.2 V, 8.4 V, 12.6 V, 16.8 V, otherwise the gadget will not work. At the same time, it is important to provide the same charge level.

To understand how to remake an electric screwdriver of 12 volts to lithium batteries, it is necessary to decide on the type of soldering. The most optimal option is point welding, since overheating is undesirable. Nevertheless, the solder is also appropriate. In order to avoid unnecessary expenses that will arise in case of inaccurate work, it is recommended to practice unnecessary batteries.

In order to calculate how many 18650 batteries are needed for 12V electrical screwdriver, it is worth resorting to the next calculation scheme: 2-3 nickel-1 lithium; 5-7 = 2; 8-10 = 3; 11-13 = 4.

Replacing nickel-cadmium batteries in electric screwdriver with lithium

With your own hands, replacement of accumulators of electric screwdriver with lithium is carried out by calculating their number, provided that one element will require 3.7 in. For example, for a product of 14.4 V, it is necessary to prepare 4 LI-IN banks 18650.

It is also worth considering the difference in size. To change the battery, you need to purchase a charge controller, which is installed additionally in the case with banks. In addition, it is not ruled out that you will have to replace the charger.

The main recovery methods

Several methods will help to cope with the question of how to reanimate the battery of an electric screwdriver at home. The phased implementation of recommendations will extend the service life of the unit.

Users must remember that the process is held with extreme caution, and after the completion of the manipulations, all parts must be returned to the original places.

Using increased current

The firmware using voltage and current exceeding nominal indicators helps to fight the memory effect, partially restore the lost volume.

Important! If an electrolyte is evaporated in a cheap element, then the method is useless to use. The lack of fluid with increased current cannot be restored.

Replacing cans in the battery

Repair work requires new components sold in special stores. When buying “banks”, it is necessary to check the parameters of size and volume. They should approach the original elements.

During the procedure, the faulty part is cut out, the working part is installed in its place, then it is soldered. When soldering, several factors are taken into account:

  • The procedure is carried out as quickly as possible. Heating the devices is reflected in their functionality;
  • When joining, they use native or copper plates of similar dimensions;
  • In the process, “plus” and “minus” are monitored. A negative value on the previous nutrition is attached to the positive.

Important! The repair of the charge-discharge cycle is completed. The voltage is measured followed. According to the standards, it should be 1.3 in.

Distilled water

The liquid is suitable only for protozoa, not modern devices. The evaporation of moisture is associated with overheating during operation. To eliminate problems and restoration, distilled water must be added.

  • Dismantle the battery and seek mini-education. Their number depends on the brand of equipment. The search for faults passes using a multimeter, in efficient elements the voltage is 1-1.3 V. With a reduced level, the repair of the faulty part is required.
  • Problem parts with marginal care of the hands are extracted, without damage to the connecting plates. They are necessary for reverse assembly and consolidation of nutrients.
  • A cavity with a diameter of less than 1 mm is drilled on the lateral section. It should be located closer to the lower or upper part. Drilling affects only the wall, but not the internal sections of the battery.
  • Filling with a fluid is carried out through a syringe. The container must be fully filled. In this position, the element is left for a day. After 24 hours, they are charged and left for one week.
  • An additional check of voltage and capacity passes after 7 days, if it remains at the initial positions after repair, then the hole is poured with silicone or sealed.

The method is completed by collecting the battery with the soldering of the connecting plates and the last check of the device’s performance. With the help of minor loads, complete discharge is carried out. The procedure is repeated three times (with complete restoration and reversing of the charge), with regular measurement of indicators.

Repair and replacement of batteries

The technique is suitable for all types of screws feeding. The process begins with the dismantling of the battery, checking a multimeter of serviceable and damaged parts with a reduced voltage level. Instead of faulty elements, new mini-batteries are installed.

After installation, they are connected with plates, for this purpose they are used soldering or point welding.

Attention! In the process monitor so that the details do not overheat. Work is performed in the minimum time, using rosin, flux.

How to eliminate memory effect

Frequent insufficient charging and subsequent discharge lead to the occurrence of memory effect. The device “remembers” the minimum boundaries, which causes a decrease in the capacity. The problem is found in Ni-CD (nicd), sometimes in NI-MH devices. In other varieties of power sources (lithium), it is missing initially.

To resolve the issue with repair work, it is necessary to carry out full discharge and charging the element using a light bulb in 12 in. It is necessary to solder the wires with a plus and minus to it, later they should be connected to the contact terminals of the device. To swing the device, you must repeat the circuit at least five times.

Resuscitation by freezing

The method with cold temperatures is suitable for cadmium-nickel nutritional elements. The process obeys the algorithm:


  • After complete discharge of the device, it is placed in a plastic bag and sent to the freezer.
  • After 10 hours, the battery is removed and sent to charge.
  • Then a charge of the charge is heavily and repeat the process three times.

Bosch, Interskol, Sturm Energomash and other famous brands should remember that the ability to recover is present in individual elements. The resuscitation of some at home will not help revive the battery, regardless of the accuracy of the instructions.

How to restore the battery of an electric screwdriver

There are a large number of videos on the Internet, which, for example, clearly shows the restoration of the Hitachi electrical screwdriver battery using IMAX B6. It consists in “reanimating” nickel batteries by supplying large currents. Supporters of the Restoration Express Method propose to revive the battery using simple IMAX B6 settings. The nickel-cadmium mode is set, and the battery can be reanimated in this mode.

However, warming up with pulsed food and subsequent charging are rather risky methods for nickel-cadmium batteries. The disturbed connection in the element cannot be restored with high currents. In addition, if there is not enough electrolyte inside the battery, or it is completely gone, high currents will finally “kill” the battery. Therefore, in order to prevent irreversible damage to batteries, it is recommended to first replenish their electrolyte supply with distilled water and only then charge with IMAX B6.

There is an extreme option of restoring the nickel-cadmium battery of an electric screwdriver-you can “pull” them with a large current. They will begin to charge, but not for long. Electronics fans criticizing this method assure that there was not a single case for the pulse current to restore the battery capacity for a long time. As a rule, it will rise for a very short time, and then, after a few days, the battery again “sits down”.

Is it possible to use the pulse current method. To solve the owners of the batteries. There are many videos on the Internet on how to restore the NI CD battery from an electric screwdriver. But there is an opinion that in reality, quick methods work very shortly for long. For example, if the electrolyte inside any battery from the ligament boiled, or dry, the pulse current will “kill” the element finally.

If possible, you can carefully disassemble every nickel-cadmium battery and see what condition the electrolyte is in. If it turns out to be dry, you can use the method of adding a small amount of distilled water through the syringe.

Restoration with water

In order to drill a neat hole in the battery, you will need a small drill. The hole must be made away from the center, it is better in the upper side of the element, where there is a small recess. Then fill the battery with distilled water using a syringe to the last.

After this, the batteries can be completely charged IMAX B6 and let it “stand”. The procedure is long. Restoration of 8-, 12-, 14-accumulative “cans”, depending on voltage, can take a lot of time. Ideally, you should not charge them right away, but give time to “banks” with water to stand the day. One cannot charge the batteries one by one, it is better that there are at least three or four in a bunch, for uniform voltage distribution.

Short.Term current pulses through a resistance of 40 ohms by 12 V should be supplied after water is filled into the reanimated element, and not to “dry”, as is often done.

assemble, battery, electric, screwdriver, restoration

After the batteries stood for a day, you can start charging them. The holes still do not close. Connect to IMAX so that the device “see” them. Charge and give “stand” again. If any one battery does not recover. Find a weak element in a bunch using a multimeter and add water again to it.

The main essence of this scurpatic method of repairing the battery of an electric screwdriver is to restore the connection of the batteries with their contact-interpretation tires (the internal device Ni-CD is similar to the scheme according to which solar batteries are made). The main reason for the cessation of the operation of batteries is the detachment of plus contact from their internal part.

The holes drilled in batteries do not close until the charge of the battery is stable. As soon as the charge stabilizes, the holes are carefully sealed with silicone. Water can be periodically added at any time.

As it has already become clear, this method is not intended for the lazy and for those who do not want to delve into the intricacies of the electronics device. However, the method with distilled water helps to save a lot of money and is the answer to the question of how to restore the battery of an electric screwdriver with the most gentle method. Typically, in the configuration to the screwdriver, two batteries are included. One can be used, and the other is gradually restored. This method, despite its duration, seems more humane and safe for the battery.

Alteration of the 12v electrical screwdriver from Ni-CD to Li-Ion Batteries

This is the so-called charge control board, the battery discharge, specifically in my case CF-4S30A-A. As can be seen from the marking, it is designed for a battery of four “cans” 18650 and a discharge current up to 30a. The so.Called “balancer” is also built into it, which controls the charge of each element separately and excludes uneven charging. For proper operation of the board, the batteries for assembly are taken with one container and preferably from one batch.

In general, there are a great many BMS boards with different characteristics on sale. I do not advise you to take the current below 30a. The fee will constantly go in defense and to restore work on some boards you need to briefly submit a charging current, and for this you need to remove the battery and connect to the charger. On the board that we consider, there is no such lack, you just let go of the trigger of an electric screwdriver and in the absence of short.Circuit currents, the payment will turn on itself.

To charge the converted battery, the native universal charger perfectly suited. In recent years, Interskol has begun to complete its instrument universal.

The photo shows to what voltage BMS the board charges my battery together with a standard charger. The voltage on the battery after charging 14.95V is slightly higher than the one necessary for 12 volt electric screwdriver, but this is more likely even better. My old electric screwdriver has become more frozen and more powerful, and the fears that it would burn out, after four months of use, gradually dispelled. It seems to be all the main nuances, you can start alteration.

We fall out old jars and leave the terminals with the thermal attewer. If you remove the sensor, then when using the full.Time it does not turn on.

According to the scheme in the photo, we solder 18650 elements in one battery. Jumpers between the “banks” should be made by a thick wire of at least 2.5kv. Mm, since the currents during the operation of an electric screwdriver are large, and with a small section, the power of the tool will drop sharply. They write on the network that soldering Li-Ion can not be afraid of overheating, and recommended to be connected using spot welding. You can only solder you need a soldering iron in more powerful at least 60 watts. The most important thing is to solder quickly, so as not to overheat the element itself.

It should turn out about to enter the battery housing.

assemble, battery, electric, screwdriver, restoration

From the board to the terminal of the wire should be flexible, as short as possible and the cross section is at least 2.5 kV. Mm.

We carefully place the entire circuit in the case and fix it with any seal to prevent damage to the parts.

To fix the terminal, I simply placed it in place and has grinded it with wooden wedges. It remains only to assemble the case.

The weight of the standard NI-CD battery is 558 grams as you can see.

The weight of the converted battery is 376 grams, therefore, the tool became easier to 182 grams. In conclusion, I want to say that this alteration is worth it. The electric screwdriver has become more powerful and the charge is enough much longer than with the native battery. Redo it, you will not regret!

But is this replacement so good?

  • One. Lithium. Ion batteries are more expensive. You will have to lay out 250-500 per piece.
  • 2. The next disadvantage is their whimsicality to charging. They do not tolerate either the redesign or the rejection and, frankly, it is better to charge them with a “smart” charger, which, upon reaching a certain voltage, reduces the current supplied to the batteries.
assemble, battery, electric, screwdriver, restoration

In order not to overpay and take exactly what you need to look at the characteristics of your electric screwdriver. The power consumption and voltage should be indicated there. The first must be divided into the second. You will get the maximum value of current consumed by an electrical screwdriver. When choosing a battery, you need to focus first of all on its current delivery (you can see it in its specification), since if too much current is removed from the battery, a fire, heating or release of gas hazardous for health can occur. The following models are popular among high current batteries: Samsung 25r, LG He2, LG He4, Sony VTC5.

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.

1997 NiCd Cordless Screwdriver Teardown (It still works after 20 years!)

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. About which battery is better for an electric screwdriver, you can find out here →

To complete the replacement of batteries in an electric 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 (its ampezh depends on how many volts an electric 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 an electric screwdriver and check its work.

Sometimes it seems that it is very difficult to repair the battery of an electric screwdriver of Hitachi. 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 an electric screwdriver on its own. This will not only save financial resources, but will also contribute to the acquisition of valuable and useful skills.

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