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

[AubreeLee]

It takes about 20 minutes of idling to fully charge a car battery. Here are four battery maintenance tips: 1. Avoid parking the car in an open parking lot for extended periods: If long-term parking is necessary, remove the battery to prevent freezing damage; 2. In winter, car engines are harder to start—limit each start attempt to 5 seconds, with at least 15 seconds between attempts; 3. Start the car periodically to recharge the battery: Regular charging is essential, as unused batteries gradually self-discharge and may become unusable; 4. Clean the battery terminals periodically: Apply specialized grease to protect the wiring harness and routinely inspect battery components and connections.