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How Long Does It Take to Fully Charge a Dead Car Battery After Jump-Starting?

1 Answers

LaylaLee

07/29/25 5:02pm

After a car battery is dead, using the car's alternator to fully charge the battery requires the engine to maintain a speed of at least 2000 RPM, and the car needs to be driven for at least 4 hours. More detailed information is as follows: 1. If the engine speed does not reach 2000 RPM, the charging time will be even longer. The car's alternator needs to operate at speeds above 2000 RPM to reach full load, at which point the power generation reaches the nominal value on the nameplate. 2. In the case of a dead car battery, external jump-starting is required by connecting the battery's positive terminal to the power source's positive terminal and the battery's negative terminal to the power source's negative terminal to start the car. Inexperienced beginners are not advised to attempt this themselves to avoid accidentally reversing the electrodes and damaging the vehicle. 3. A car battery, also known as a storage battery, is a type of battery that works by converting chemical energy into electrical energy. Typically, what people refer to as a car battery is a lead-acid battery, which is mainly made of lead and its oxides, with a sulfuric acid solution as the electrolyte.

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