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How Long Does It Take to Fully Charge the Battery at Idle Speed?

1 Answers

SabrinaAnn

07/29/25 4:55pm

When a car is completely out of power, charging at 1500 RPM for 20 minutes can provide enough power to start the engine once. If charging at 1500 RPM for more than 60 minutes, the battery will be nearly fully charged. When the car is not in use for an extended period, it is advisable to unplug the power connector to prevent severe battery discharge. Below is an introduction to charging at idle speed: 1. If the charging indicator light is on while the car is idling, it indicates that the battery is not being charged and is still discharging. Normally, when the charging indicator light is on, the battery is being charged, but the charging current is very small. When the ignition switch is turned on, the battery supplies excitation current to the generator and provides voltage to the regulator's detection and control section through the ignition switch, fuse, charging indicator light, and diode. 2. The energy balance in the car must also be considered. After the engine is shut down and restarted, the battery's charging state must be taken into account. The battery can be seen as an energy storage device that powers various loads. Conversely, the alternator must charge the battery as an energy provider. If the battery's discharge exceeds its charge, even a high-capacity battery will gradually discharge until it is completely depleted. 3. In reality, the charging indicator light on the vehicle does not indicate whether the battery is being charged or at what engine speed charging occurs. Under heavy load conditions, the alternator may cause the charging indicator light to go off, but the battery may not be charging and could instead be discharging. It is also important to note if the charging indicator light does not turn off even at high speeds.

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