Will leaving the car lights on for a whole day and night damage the battery?

1 Answers
DiMatthew
07/25/25 7:34am
No, leaving the car lights on overnight may drain the car battery, making it unable to start the engine the next day, and the battery will need to be recharged. Charging time for a drained battery: After the car battery is drained, using the car's alternator to fully charge the battery requires maintaining an engine speed of over 2000 RPM, and the car needs to run for at least 4 hours. Longer charging time required: If the engine speed cannot reach 2000 RPM, the charging time will be even longer. The car's alternator needs to operate at over 2000 RPM to reach full load operation, at which point the power generation reaches the nominal value on the nameplate.
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