The simplest battery charger

This is perhaps the simplest battery charger you can think of. This kind of exercise has helped me out more than once in difficult situations. It is quite easy to assemble it on your own in the absence of a soldering iron and other radio elements. This charger can charge a motorcycle or car battery in various difficult situations.

It has only two parts: an incandescent lamp and a diode. When using a 100-watt incandescent lamp, the battery charging current is about 0.25 amperes, which is quite enough to charge a motorcycle battery. You can also hang another lamp of the same type and get about 0.5 Ampere.Details: any standard incandescent lamp, 250 volts; any diode - voltage 250 volts and current not lower than 0.5 A.

Here is an even more complex circuit of this charger.

It already contains four diodes or one diode bridge. Here from one 100 Watt lamp the current is about 0.5 Ampere. But naturally, you can increase it by hanging more incandescent lamps in parallel at the rate of 1 lamp = 0.5 A. Calculate the power of the diodes yourself depending on the number of lamps and a voltage of at least 250 volts.

In general, a battery should be charged to 0.1 of its capacity. That is, if a battery has a capacity of 90 amperes/hour, then the current through it should be 9 amperes. The time from complete discharge to full charge will be about 10-12 hours. But usually few people charge with this current and they usually charge twice as much and take longer. I am telling you this so that you can calculate your charging time yourself.

Personally, I had such a case. Once I arrived at the dacha and, out of awkwardness, forgot to turn off the lights. After several hours of work at the dacha, before driving, I inserted the key into the ignition and realized that the battery was completely discharged. Not only are there no cars nearby, there are no people nearby to ask for help. Fortunately, there was electricity at the dacha. I quickly rummaged around in the shed and found a Soviet board from a tube TV. I tore out the rectifier board with diodes from there. Well, finding a light bulb is not a problem. I assembled everything in about twenty minutes. I removed the battery, connected everything, and turned it on. (If you do something similar, don’t confuse the sequence of actions!). I went and had some tea. After two or three hours I decided to try to start it, the battery was not new, but not old either. Turned it off, installed the battery, started it.The car started without any difficulties. Well, then let the car charging system work. And I got home without any problems.