How long does it take to fully charge a car battery with a charger when it's dead?

1 Answers
AidenLynn
07/29/25 11:35am
A dead car battery typically takes about 10 to 15 hours to fully charge using a charger. More detailed information is as follows: 1. When a car battery is dead, using a battery charger allows for both fast charging and slow charging methods. Fast charging only takes 3 to 5 hours, but this method is only suitable when you need to use the vehicle urgently. This is because fast charging only quickly activates the surface of the battery, while the interior of the battery is not fully charged. 2. The slow charging method requires approximately 10 to 15 hours and is suitable for situations where the battery is dead due to depletion. This method ensures the car battery is completely charged, meeting the requirements for normal driving and preventing the battery from running out of power after a short distance.
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