It's good if you have a car charger on hand. But life often brings us to such situations when this device may not be at hand or, as luck would have it, it will fail.
If you are faced with a similar problem, then ingenuity will help you.
We will need a power supply from a laptop, which is usually found in every home and sometimes not in single quantities. They are almost all of the same type and run on a voltage of 19 Volts. Car light bulb 21 Watt (12V 21V). If you want to speed up charging, you can take two of these bulbs connected in parallel to each other, or take one 55-watt high or low beam lamp.If suddenly you don’t have an extra light bulb, take it out of any available flashlight while charging.
We take the battery, unscrew the lids of the cans for better ventilation.
Then we take a block from a laptop and a light bulb and connect all these three elements, including the battery, in series using a wire.
Connection diagram.
Connection to the power supply.
The minus of the block is connected to the minus of the battery.
Charging, of course, takes a long time, but it takes a couple of hours to refresh the battery a little.
In general, when my charger burned out, I left this circuit overnight - and in the morning I received an almost fully charged battery, provided that, of course, it was not completely discharged.
The current through one 21 Watt light bulb is approximately 1 Ampere. If you take two of them, it will be approximately 2 Amperes. In general, it is quite possible to charge a battery in a day, even from scratch.
If you have the opportunity to measure the battery voltage, then 14.2 is the voltage of a fully charged battery.
Yes, keep in mind that the load current of the unit, look at the housing and do not exceed it. Typically it is 3 Amps.
Do not forget that when charging, hydrogen is released from the battery cans - do not forget about ventilation of the room.
Use your wits, friends, and you will be able to get out of most seemingly hopeless situations.
