How long does it take to fully charge a car battery by idling?

1 Answers
MasonMarie
07/29/25 8:42pm
It takes approximately 16 to 20 hours of idling to fully charge a car battery. Taking a 12V60Ah battery as an example, the charging method adopts constant voltage with current limiting - charging at 14.8V constant voltage and 15A current limit for 16 hours. If the car battery is dead, an external power source can be used for charging. Using the car's alternator to charge it consumes significant time and also burns vehicle fuel. A car battery, also called an accumulator, is a type of battery that works by converting chemical energy into electrical energy. Batteries are categorized into conventional flooded batteries, dry-charged batteries, and maintenance-free batteries. The commonly referred-to car battery typically means lead-acid batteries. The normal service life of a car battery ranges from 1 to 8 years, largely depending on the vehicle's condition.
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