At one point, when I got my screwdriver from the pantry, I discovered that it was not working. Batteries were discharged, the first thing I thought, and put the screwdriver on charge. But as soon as I connected the charger to the battery, it immediately showed the full charge of the battery. I connected the tester to check the charging and it turned out that the batteries have high resistance, which meant their failure.
Replacing the batteries of the screwdriver
Running through the forums, I found out that the problem of the failure of the nickel-cadmium batteries used in the screwdrivers is not at all new, but rather very common. In general, these batteries, in addition to cheapness, are a plus for the manufacturer, and have a bunch of shortcomings that are identified during operation. This is both a small life cycle, and a small capacity, and a small battery life. All forum users who are faced with a similar problem without thinking boldly change their nickel-cadmium batteries with lithium-ion batteries, which I myself will do.That they may be more expensive, but the screwdriver will work much longer and longer.

Replacement screwdriver

Without hesitation, I bought a 18650 lithium-ion batteries. Since the screwdriver is 18-volt, and one battery gives 3.7 V, therefore, I needed 5 pieces. 5x3.7 = 18.5 V - what you need. Also I bought the battery compartments, one for two batteries, the other for three. Connected all in series. He pulled out old batteries and replaced them with new ones.
Replacement of screwdriver batteries
Replacement of screwdriver batteries
Replacement of screwdriver batteriesReplacement of screwdriver batteriesReplacing the screwdrivers batteries
Replacing the battery screwdriver
This could be summed up, but as it turned out, I made a terrible mistake. The fact is that lithium-ion batteries should not be charged in any way as old batteries! It is even dangerousso how can they just just explode. How then to be? All is not so difficult - you need a charging controller for lithium-ion batteries. Lithium-ion batteries are very sensitive to recharge, to the level below the norm - all these factors quickly disable them. This is perhaps their main disadvantage. But it's easy to get rid of it using a controller that will take over all the functions of monitoring and limiting dangerous modes and will make battery operation at a quality level.Buying links:

Wiring diagram for charging controller

Replacing the batteries of the screwdriver
The batteries are also connected in series, except that a contact is output to each connection between the batteries to the controller. As a result, the controller monitors the status of each battery and does not allow it to recharge in the circuit. I assembled the circuit. Everything works fine.
Replacing the screwdrivers batteries
Replacing the screwdrivers batteries
Replacing the screwdrivers batteries
Replacing the batteries of the screwdriver
Video checks

Assemble the battery of the screwdriver

Since added controller, battery compartments had to be abandoned, as the place was sorely lacking. Well, this is for the best, as the screwdriver is subject to vibration, and not close contact could not have a very good effect in the future ... I decided to solder the batteries together. In general, lithium-ion batteries are very afraid of overheating and must be connected by resistance welding. But I don't have it. So I soldered all the soldering iron. If you do this, you will learn: use only a powerful 40-60 watt soldering iron. Make soldering with acid or active flux. And in no case do not solder one connection more than a second. If it didn't work out the first time, it’s better to wait five minutes and repeat again. As a result, I did this:
Replacing the screwdriver batteries
Soldered the circuit.
Replacing the batteries of the screwdriver
I blinded the batteries with scotch tape and installed them aslant into the battery compartment of the screwdriver.
Replacing the screwdrivers batteries
Replacing the screwdrivers batteries
Replacing the screwdriver batteries
Charging is on.
Replacing the batteries of the screwdriver
I soldered all the wires to the terminals and received at the output an updated battery for my old screwdriver, which I hope will last more than one year.

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