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How long does it take to fully charge a depleted car battery?

1 Answers

OPeter

07/25/25 3:07pm

A depleted car battery can be fully charged by running the engine for 4 hours. The car battery, also known as a storage battery, is a type of battery that works by converting chemical energy into electrical energy. It refers to a lead-acid battery, which is primarily made of lead and its oxides, with sulfuric acid solution as the electrolyte. Avoid leaving your car parked for too long, as prolonged inactivity can lead to battery depletion. Try to prevent extended parking in open-air parking lots. Signs that indicate a fully charged battery: 1. The indicator eye turns green when fully charged; 2. A large number of bubbles appear in the battery, creating a "boiling" phenomenon; 3. The terminal voltage rises to its maximum and no longer increases within two hours; 4. The electrolyte level rises to its highest point and no longer increases within two hours.

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