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Why are there warning lights after restarting a car with a dead battery?

1 Answers

StPreston

07/29/25 3:05pm

Because this situation will inevitably generate historical fault codes, which is why the warning lights illuminate. It is generally recommended to visit a repair shop and use a diagnostic scanner to directly clear the fault codes, which will turn off the warning lights. Below are the reasons for battery depletion: 1. Electrolyte evaporation: The electrolyte (dilute sulfuric acid) inside the battery gradually evaporates when the battery temperature rises, especially during summer. Unscrew the four sealing caps on the battery to observe—they have anti-splash vent holes designed to release steam generated inside the battery due to temperature increases. 2. The battery's function: It provides a high instantaneous current when starting the car, typically reaching dozens of amps or even higher. After the engine is running normally, the battery's primary role is to continuously supply power to the ignition coil, audio system, and other electrical devices. Simultaneously, the electricity generated by the alternator recharges the battery, ensuring it does not become depleted during use.

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