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What is the usage method of a car battery charger?

2 Answers

HectorFitz

07/25/25 7:49am

The usage method of a car battery charger is: First, connect the positive terminal of the charger to the positive terminal of the battery, and the negative terminal of the charger to the negative terminal of the battery. Then, press the charging button to start charging. Car owners do not need to wait until the battery is fully charged before unplugging it; as long as there is enough power to start the car engine, that is sufficient. Once the engine starts, it will drive the alternator via the belt, and the generated electricity, after rectification and voltage stabilization, will directly charge the car battery. Normal driving for one to two hours is usually enough to restore the battery to its normal charge level. It is important to note that you should avoid frequently overcharging the battery. Although the current produced by the charger is not very high, prolonged boiling of the electrolyte can not only cause fine particles on the surface of the active material to detach easily but may also lead to oxidation of the grid framework, resulting in loose separation between the active material and the grid framework.

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LunaDella

08/10/25 6:42pm

I've been driving for over a decade and safety is paramount when using a battery charger. First, use a multimeter to check the battery voltage, ensuring it's within the 11-13 volt range. If it's too low, charge it slowly. When connecting, attach the red clamp to the positive terminal (marked with a + on the battery) and the black clamp to the negative terminal or a metal point on the car body. Don't reverse them to avoid short circuits. Set the charger to slow charge mode, typically at 2 amps, to prevent battery damage. During charging, I regularly monitor the voltage. When it rises to around 14.5 volts, it's nearly full—avoid overcharging as it shortens battery life. After charging, disconnect in reverse order: remove the black clamp first, then the red one to prevent sparking. I charge my older car monthly to prevent discharge, especially in winter when cold starts are tough. A smart charger that stops automatically is convenient, but avoid frequent fast charging as it can cause overheating and damage the battery.

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