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How long can you turn off the engine after jump-starting a dead car battery?

1 Answers

LaReagan

07/29/25 8:06pm

If the engine is running at a speed above 2,000 RPM, it will take at least 4 hours to fully recharge the battery. If the RPM is below 2,000, the required time will be even longer. Additionally, charging while driving takes less time compared to charging at idle. Methods to restore a dead car battery: Pulse repair: The most effective method to eliminate sulfation in a battery is pulse repair, which involves using instantaneous voltage between 60V and 300V. Higher pulse voltage shortens the repair time, while lower pulse voltage prolongs it. Full charge and discharge repair: This method involves fully charging the battery and then completely discharging it to restore the battery. Solutions for a dead battery that prevents starting: If the car owner encounters a situation where the battery is dead and the car won't start, they can seek help from other drivers to charge their car battery using jumper cables. However, the owner must ensure that the positive terminal of the battery is connected to the positive terminal of the power source, and the negative terminal of the battery is connected to the negative terminal of the power source. Incorrect connections should be avoided to prevent accidents.

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