How long does it take to charge a car battery with 12v?

1 Answers
McAlaina
07/30/25 10:46am
Car battery charging time with 12v is: 12V charging adopts constant voltage current limiting method, constant voltage 14.8V current limiting 15A charging for 16 hours, then constant current 3A charging for 4 hours, totaling 20 hours. The charging time required for a battery is determined by its capacity, not voltage. A fully charged battery can be judged by the following phenomena: 1. The battery produces a large number of bubbles, i.e., "boiling" phenomenon occurs, and the terminal voltage rises to the maximum value and no longer rises for two hours; 2. The electrolyte rises to the highest level and no longer rises for two hours; 3. Observe the battery indicator eye, the fully charged state can be determined by the green color of the indicator eye.
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