How long does it take to charge the battery at car idle speed?

1 Answers
McMorgan
07/29/25 2:39pm
It takes about 20 minutes of car idling to charge the battery. Idling is to overcome the engine's own operating resistance, maintain engine speed, and make it more convenient for the driver during driving and temporary parking. Precautions for charging the battery at idle speed are: 1. Check whether the charger is dual-purpose for 12V and 24V. If it is not dual-purpose, a 24V charger cannot be used for charging; 2. For water-added batteries, the lid needs to be opened during charging, while maintenance-free batteries can be charged directly. The functions of the car battery include: 1. Providing power for the car's starter and ignition system; 2. Providing a stable DC power supply for car electrical appliances.
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