How many hours is best to charge a car battery?

1 Answers
JudahLee
07/30/25 1:08am
It is best to charge a car battery for 10-15 hours. Here are some precautions when charging a car battery: 1. Do not completely disconnect the vehicle power: If using a charger, connect directly to the battery for charging without removing it, otherwise data loss may occur, requiring initialization, commonly known as decoding or code matching. 2. Battery warning light on: If the car battery warning light is on, it needs to be charged promptly. For a running vehicle, charge at 1500 RPM for over 60 minutes, then at over 1900 RPM for another 60 minutes or more. 3. Battery discharge: If the car is not used for a long time, the battery discharges about 1% daily. If left connected to the car, the vehicle maintains a minimum current (commonly known as 'sleep' current) of about 80mA. If there is an anti-theft alarm, it will consume additional power, generally depleting about 2~3% of the battery's charge daily.
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