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How long does it take for the car battery to drain if the interior light is left on?

1 Answers

SanValerie

07/24/25 8:16pm

The interior light being left on will drain the battery in about 20 hours. The power consumption of the interior light is very low, and it takes more than 20 hours of continuous use to deplete the battery. If the light remains on after the engine is turned off, it can shorten the lifespan of the battery. It is recommended to turn off all electrical devices before shutting off the engine. If the interior light does not turn off automatically after locking the car, it may indicate that a door is not properly closed, so it is advisable to check at this time. Precautions for using interior lights: 1. Switch usage: There is a switch located in the center of the ceiling on the right side of the driver's compartment. 'NO' means manual forced full-on, 'OFF' means manual forced off, and pushing the switch to the middle position activates the automatic lighting mode. When all car doors are fully closed, the default setting is for the light to dim and then turn off automatically after a short while when the car is started or parked with the engine off. If a door is opened or any other operation is performed on the car, the interior light will turn on. 2. Avoid prolonged use: If the interior light is left on for an extended period, it will consume a small amount of power after the engine is turned off. Over time, this can lead to battery drain and also cause the bulb to overheat, affecting the lifespan of the interior light.

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