How to charge a battery without a charger

Imagine, you came to the village to visit your relatives and accidentally your battery ran out. What should I do? We ran around the neighboring neighborhoods, no one had a charger.
And this is just one example when you need to charge the battery, but there is no charger for it. But there is always a way out. Now you will see a charger circuit that anyone can make from two parts that can definitely be found even in the most run-down village.

Circuit diagram of the simplest charger

The charger consists of a plug with a wire, an incandescent lamp and a diode. The first two are clear where to get them, and the diode can be found in an old TV, generator or somewhere else, this is definitely not a shortage.
In fact, everything is connected in series to the network. The lamp plays the role of a quenching resistor, and the diode acts as a rectifier.

Assembling the charger and charging the battery

The main thing is to turn on the diode correctly so that the battery is charged and not discharged.

We assemble the entire circuit in about 15 minutes.

If there multimeter, then you can measure the charge current.

It is, of course, small, but to refresh the battery, you can leave the battery charging for a day.
In order to increase the current, you can use a more powerful incandescent lamp or turn on another one in parallel with the existing one.
Advice: if for some reason you do not know how to turn on the diode correctly, connect it to the circuit with either side and notice the brightness of the lamp. Change the switching poles and again notice the brightness of the lamp approximately by eye. Turning on will be correct then the lamp will burn with less brightness, since the battery, when turned on correctly, will create a decrease in voltage across the lamp.

Safety precautions

This is the simplest charger in the world and the most dangerous at the same time, since it has no galvanic isolation from the network. Do not touch the circuit elements under any circumstances after you have connected the circuit to the network. This is perhaps the most important and only rule that cannot be neglected.

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Comments (7)

#1 Dmitriy Guests 12 December 2019 19:56
2

If there is somewhere to find one diode, then you can find 4. Make a bridge out of four. There is a lamp at the entrance of the bridge. To the battery output. With the same lamp, the charging current will double. In addition to the lamp, a 0.5-1 kW heater will be used. Diodes will have to be selected at least 5-6A
- Answer
#2 Yuri Guests December 13, 2019 11:20
4

Have you forgotten about the reverse voltage of the diode? If it breaks while charging, there will be problems. In addition, when using a powerful load at high currents, radiators for diodes will be required.
- Answer
1. #3 Vladimir Guests December 13, 2019 12:29
  3
  
  If there is a breakdown, nothing bad will happen. There will be a cyclic charge/discharge.
  
  Answer
  1. #4 Yuri Guests December 13, 2019 21:48
    3
    
    AC charging? Well, take a chance.
    
    Answer
#5 Alexander Klintsov Guests 18 December 2019 20:41
1

You didn’t come to the village on an excursion, but to visit your relatives, I suppose. So let the relatives push along with the neighbors, businesslike.
- Answer
1. #6 Andrey Alexandrovich Kuzin Guests 22 December 2019 13:54
  3
  
  It's especially good to push with an automatic transmission.
  
  Answer
#7 Mazda2 Visitors 17 November 2022 14:55
0

Yuri, when the diode breaks, the alternating current will be 2 times greater than the rectified current before the breakdown and it will not harm the battery. Desulfation is even specially carried out with a similar current.
- Answer