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.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 screwdriverWithout 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.
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Assemble the battery of the screwdriverSince 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:
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