How to Disassemble a Battery from an Electric Screwdriver

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How to recover the battery of an electric screwdriver

The use of DC power sources has made it possible to create a compact and mobile tool. As the battery capacity decreases and the performance of the equipment drops, the owner is faced with the question of how to restore the battery of an electric screwdriver. Algorithm depends on the type of battery, some products are not repairable and are replaced with new devices.

List of necessary tools

Screwdriver battery repair or diagnosis is impossible without certain tools and measuring instruments. For battery repair it is not necessary to buy expensive tools, the budget manufacturers will be quite suitable.

List of tools required for screwdriver battery repair:

  • Multimeter. A measuring device that allows you to determine the DC and AC voltage, resistance, amperage, or to test the circuit for breaks. expensive models are able to measure the capacity of cells, but they are not useful to the home handyman.
  • Screwdriver and flathead screwdriver. An indispensable tool that will help you a lot in the future.
  • Pinsmith knife with interchangeable blades.
  • Soldering iron. Power of 40 watts will be enough. The larger models are more expensive and may damage the cell if handled incorrectly.
  • Tin and solder. Inexpensive consumables.

Consumables will also be useful, such as electrical tape or heat shrink tubing, household glue, small pieces of wire.

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General recommendations for repair

How to repair an electric screwdriver battery? Have a basic understanding of electrical engineering. Battery circuitry is simple. A simple series circuit (plus is connected to minus).

The following recommendations should be considered when repairing a Ni-Cd:

  • They have a memory effect. The classic input pattern for such a battery is three full charges and three discharges to zero. The new cell must undergo the same rocking.
  • Similar element. A new element must match the previous rating to prevent it being knocked out of circuit or damaging the battery in any way.

The lithium battery of an electric screwdriver can be repaired at home if you consider the following:

  • They should not be soldered. Intolerance to high temperatures will result in an unrepairable condition. You need to use contact welding (it heats the electrode for a short time without harming the battery). If there is no access to CS: GO, allowed soldering very powerful soldering iron from 100 watts. The movement must be fast and precise.
  • Same models. Now there are several major manufacturers of lithium batteries, which are used in popular foreign models of screwdrivers, such as Hitachi, Makita and domestic: Interskol, Zubr.

Replacing the nickel-cadmium batteries in an electric screwdriver with lithium batteries

Replacement batteries of an electric screwdriver with their own hands on lithium batteries is carried out by calculating their number, assuming that one cell requires 3.7 V. For example, for a 14.4 V product, you must prepare 4 cans of Li-Ion standard 18650.

It’s also worth considering the size difference. To change the battery you will need to buy a charge-discharge controller, which is installed additionally in the case with cans. In addition, it is not excluded that you will have to replace the charger.

Common malfunctions

Owners of screwdrivers who have decided to do the battery repair themselves, should familiarize themselves with the most common types of faults. There are several reasons why batteries stop functioning properly:

  • destruction of the plates;
  • short circuit;
  • contamination of the electrolyte;
  • polarity reversal;
  • Crystal degradation due to prolonged storage in a discharged state.

Additional information! By yourself to cope with the consequences of such breakdowns is quite difficult. That is why many decide to entrust the repair of the battery to professionals.

disassemble, battery, electric, screwdriver

How to disassemble the battery with an ordinary mallet

In order to disassemble the battery from an electric screwdriver Bosch, “Metabo” or any other tool for 12 volts and more, you need to make some effort. If you simply pry open the edges of the battery pack adjoining each other with a screwdriver, you will get sloppy. In addition, there is a greater risk that the fragile plastic construction will simply break.

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Therefore it is recommended to take a mallet and start tapping slowly on the edge of the seam until the characteristic sounds. which means that the seam itself starts to loosen slowly. It takes a long time to knock and it takes time and patience. But this is the way to ensure that the disassembly of the battery from the electric screwdriver “Makita” will be successful, without unnecessary damage and losses.

After a while there will be a crackling sound of the seam breaking. The batteries themselves inside will not be damaged by such manipulation. Only the seam that holds the block together is broken, while the “cans” and the two halves of the plastic housing remain intact.

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When we disassemble the unit, tap with the mallet on the housing lightly, without much effort, so that it bounces slightly off the surface. From time to time, between taps, you can try to slowly pull back the bottom cover of the unit, thereby checking to see if the seam has loosened. In such cases, except that the hammer itself will be slightly damaged, but there’s nothing wrong with that.

When clicking clicks become regular, you should check the unit with a thin knife, carefully inserting it between the body halves. When the two body parts start to come apart you can see it, so we are almost there.

It is worth warning that the battery packs of 12-volt electric screwdriver “Makita” are often rarely strong and difficult to disassemble. But if you slowly work with the mallet, the seam on the glue will gradually crumble. In terms of time, it can take ten minutes or more. But for a person with experience, the entire process takes no more than six minutes.

This is how, gradually and carefully, you can disassemble the battery of an electric screwdriver, which the manufacturer deliberately made “non-removable”. in order not to change the batteries in it, and immediately run to get a new one, which is expensive. Of course, this requires a certain amount of skill and care. But will save you money, and at the same time learn how to disassemble the battery from an electric screwdriver “Makita” with your own hands.

Finding a malfunction

Finding the sources of the problems that have arisen involves the use of several methods:

  • Using a multimeter. helps to diagnose the condition of the devices you are charging;
  • Load. uses a 12 volt car light with 35 watts of power.

The above methods allow you to make a diagnosis without opening the battery. An additional method of checking is considered the release of gas from the devices, with the opening of the housing. The latter technique restores functionality for a short time.

Causes of Complete Discharge

Zeroing the elements is associated with the peculiarities of storage:

Important! The problem with new tools is related to storage violations by the retailer, who uses unheated warehouses.

How to Repair an Electric Screwdriver Battery

There are many videos on the Internet that, for example, clearly show the battery recovery of a Hitachi electric screwdriver using the Imax B6. It consists in “reanimating” nickel batteries by applying high currents. To revive the battery supporters of the express method of restoration suggest using the simple settings Imax B6. You set the mode to nickel cadmium, and the battery can be resuscitated in this mode.

However, heating with pulse power and then charging it is a rather risky method for Ni-Cd batteries. The broken link in the cell can not be restored by high currents. And if there is little or no electrolyte in the battery, the high currents will finally “kill” the battery. That’s why, in order to prevent permanent damage to your batteries, it is advisable to refill them with distilled water first and then charge them with Imax B6.

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There is an extreme option, how to restore the nickel-cadmium battery of an electric screwdriver. you can “pull” them with a large current. They will start charging, but not for long. Electronics fans who criticize this method assure that there was not a single case when the pulse current restored the capacity of a battery for a long time. As a rule, it will pick up for a very short time, and then, after a few days, the battery will “go dead” again.

Whether you can use the pulse current method is up to the battery owners to decide. 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 the fast ways work for a very short time. For example, if the electrolyte inside any of the batteries from the bundle has boiled out, or dried out, the pulse current will “kill” the cell permanently.

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

Restoring with water

To drill a neat hole in the battery, you will need a small drill bit. The hole should be made away from the center, preferably in the upper side of the cell, where there is a small recess. Then fill the battery with distilled water with a syringe to the last.

The Imax B6 battery can now be fully recharged and allowed to “settle”. The procedure is long. Recovering 8-, 12-, 14-battery “banks”, depending on the voltage, can take a long time. Ideally, you should not charge them immediately, and give time to “banks” of water to stand for a day. Do not charge the batteries one at a time, it is better to have at least three or four in a bundle for even voltage distribution.

Short-term current impulses through the resistance of 40 ohm to 12 V should be applied after the cell to be reanimated will be filled with water, and not “dry”, as it is often done.

After the batteries have stood for a day, you can begin to charge them. Leave the holes open for now. Connect to Imax to let the device “see” them. Charge and let it “stand” again. if any one battery fails to recover. Find the weak cell in the bundle with a multimeter and refill it with water again.

The main point of this scrupulous method of repairing the battery of an electric screwdriver is to restore the connection between the plates of the batteries and their contact-transition bars (the internal structure of Ni-Cd is similar to the circuitry used to make solar batteries). The main reason the batteries stop working is the delamination of the plus contact from their interior.

Do not close the holes drilled in the batteries until the battery charge is stable. Once the charge is stable, carefully seal the holes with silicone. Water can be refilled periodically 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 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 in the most gentle method. Usually a screwdriver comes with two batteries. One can be used and the other gradually restored. This method, despite its duration, seems more humane and safer for the battery.

Replacing all cells in the battery pack

The required number of cells can be ordered from any online store, depending on the number of old batteries. It is important to ensure that they all initially have the same capacity.

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You can completely replace all the cells in the battery pack with new nickel-cadmium batteries. They are much cheaper than nickel metal hydride batteries and, compared to other batteries, the most durable. Recently, however, it has become increasingly common to convert batteries “from cadmium to lithium” on their own, in other words, to install new lithium-ion batteries instead of the old Ni-Cd.

Despite their reliability, Ni-Cd batteries can fail quickly because they are wired in series with each other without a balancing board. If the batteries are from the same batch of manufacture, their parameters will still have a wide variation between each other. With this connection, one cell will charge faster, the other slower, and the third might 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 the manufacturers. As for lithium cells, balancing plates are installed in such battery packs because without them overheating can occur with a subsequent explosion: here the manufacturers simply have nowhere to go. To find out which battery is best for an electric screwdriver, click here →

To make a complete replacement of batteries in an electric screwdriver from nickel-cadmium to lithium-ion, you will need

  • A number of cells equal to the number of the former ones (with the same capacity rating);
  • balancing board 5S (its amperage depends on how many volts the electric screwdriver is designed for);
  • a tester or multimeter ;
  • A soldering iron with a good “sting”;
  • Good quality flux and lead solder ;
  • AVG 16 silicone wires ;
  • Heat-resistant adhesive tape and hot melt glue.

Before you start soldering, discharge the batteries. Remove the old batteries from the block and free the contacts. The old temperature sensor is better not to throw away, but leave it as an additional protection against overheating the lithium.

Now the main thing is to solder the lithium correctly. In advance, cut the wires of the right length, insulated, in silicone, very thick, to avoid them melting while heating the lithium. Use a knife to clean the solder pads of batteries.

disassemble, battery, electric, screwdriver

Warm up the iron to 300°C and start soldering with flux and lead solder. Flux should be of good quality, indelible, and not conductive. Never use acid fluxes. Solder for no more than 2 seconds to avoid overheating the lithium. To escape the heat faster, you can, after soldering, put to the battery any iron object that takes the heat.

Let the batteries cool and connect pluses and minuses together as usual. Check the total voltage. It should average 20.7V if there are 15 cells.

After measuring the voltage attach the board. All of its wiring should be laid with special gaskets so that nothing “shorted” during operation. Tape the entire battery pack together with heat-resistant adhesive tape designed specifically for isolating batteries and their contacts.

Solder the wires and connector. If the contacts are “loose”, they can be sealed with hot melt glue. Now, finally, you can finally assemble the battery pack of an electric screwdriver and check its work.

Sometimes it seems that it is very difficult to repair the battery of a Hitachi electric screwdriver (or other tool). But if you understand the general principles, such as the basics of electronics, the construction of batteries from the inside, types of batteries and the main principles of proper soldering, it becomes clear how to repair the battery for an electric screwdriver by yourself. This will not only save you money, but will also help you acquire valuable and useful skills.

Black and Decker KC9072 Screwdriver Battery Replacement

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