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How long should you drive after jump-starting a dead car battery?

1 Answers

MacLevi

07/30/25 7:15am

After a car battery dies, using the vehicle's alternator to fully recharge the battery requires maintaining an engine speed above 2,000 RPM, and the car needs to be driven for at least 4 hours. Additional information about a dead car battery is as follows: 1. If the engine speed cannot reach 2,000 RPM, the charging time will be even longer. 2. The vehicle's alternator needs to operate above 2,000 RPM to reach full load capacity, at which point its power generation matches the nominal value on the nameplate. 3. To jump-start a dead car battery, connect the positive terminal of the battery to the positive terminal of the power source and the negative terminal to the negative terminal to start the car. Inexperienced beginners are not advised to attempt this themselves to avoid accidentally reversing the polarity and damaging the vehicle.

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