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How long does it take to fully charge a car battery that has no power to start the engine?

1 Answers

GenevieveDella

09/01/25 6:29am

It takes about 20 hours to fully charge a car battery that has no power to start the engine. Here are the reasons why a car battery may lose power: 1. The car has been parked for a long time, causing the battery to discharge: Even when the car is idle, the battery will discharge due to its self-discharge characteristics, even if it is not being used. 2. The battery has reached the end of its service life: Most private cars use maintenance-free batteries. Clean the inspection eye on the battery and observe the color inside. If it is green, it means the battery is normal. 3. Insufficient battery electrolyte or leakage: During normal use, the electrolyte in a car battery will naturally evaporate and deplete. Therefore, during routine maintenance, the electrolyte level should be checked frequently and should be between the maximum and minimum levels. Insufficient electrolyte will naturally lead to insufficient power storage in the car battery.

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