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How Long to Idle Charge a Car Battery After It's Drained?

1 Answers

OscarLynn

07/30/25 7:04am

If the car battery is drained, idling for over ten hours won't fully recharge it. To fully charge a drained battery, a dedicated battery charger is required. If your battery is drained, after jump-starting the engine, you should drive the car to a professional repair facility to charge the battery with a dedicated charger. Here's more information: 1. Causes: Battery drain occurs due to prolonged inactivity of the vehicle. Even after turning off the car, some systems continue to operate and consume battery power. If the car is left unused for an extended period, the battery keeps discharging without being recharged, leading to drain. This significantly impacts the battery's lifespan. 2. Battery Function: The battery is a crucial component in a car. When the engine is off, the battery powers all electrical devices in the vehicle and is also responsible for starting the engine. Once the engine is running, the alternator takes over, supplying power to all electrical devices and recharging the battery.

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