How to charge a car battery with a laptop power unit

This article is from the category - you need to know every motorist. Already very soon, the winter and many owners of a car with an old battery will have to wait for a surprise: when attempts to start a steel horse will not be crowned with success. As a result, the battery will be completely discharged due to these actions. Such a failure may well happen with the owners of brand new batteries. No one is immune from this.
How to charge a car battery with a laptop power supply
It’s good if you have a car charger on hand. But often life fails under such situations when this device may not be at hand or it will malfunction worse than evil. If you encounter a similar problem, you will be savvy. We will need a power supply from a laptop, which is common in every home and sometimes not in a single quantity.They are almost all of the same type and go for a voltage of 19 volts. 21 Watt car light bulb (12V 21V). If you want to speed up the charging, you can take two of these bulbs, connected in parallel with each other, or take one main beam or dipped beam for 55 watts. If suddenly you do not have an extra light bulb - pull it out of any available flashlight while charging.
How to charge the car battery with a laptop power unit
Take the battery, unscrew the covers of the cans, for better ventilation. Then take the block from the laptop and the light bulb and all these three elements, including the battery, with using wire connect in series.

Connection diagram.

How to charge a car battery with a laptop power supply
Connect to a power supply.
How to charge the car battery with a laptop power unit
The minus of the unit is connected to the minus of the battery.
How to charge a car battery with a laptop power unit
How to charge a car battery with a laptop power supply
Charging is, of course, a long thing, but it takes a couple of hours to refresh the battery a little. Generally, when my charger burned, I left such a circuit for the night - and in the morning I received an almost fully charged battery, provided that it, of course, was not discharged to zero. The current through one 21-watt light bulb is about 1 Ampere. If you take two of them, then there will be about 2 Amperes. In general, it’s quite possible to charge a battery even from scratch in a day. If you have the ability to measure battery voltage, then 14.2 is the voltage of a fully charged battery. Yes , note that the load current of the unit, look at the housing and do not exceed it. Usually it is 3 Amperes. Do not forget that hydrogen is emitted from the battery when charging from the cans - do not forget about room ventilation. Use your wits and you will be able to get out of most seemingly hopeless situations.


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