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Why is the car battery warning light on?

1 Answers

Delaney

07/30/25 6:26am

Reasons for the car battery warning light being on are as follows: 1. Battery failure, such as depleted power or battery malfunction. 2. Loose or oxidized battery terminals, poor contact can also cause the battery light to illuminate. 3. A loose alternator belt or tensioner can cause the charging system to stop working, triggering the battery light. Precautions for using car batteries are as follows: 1. Ensure the battery is securely fastened: The battery should be firmly installed in the vehicle to prevent the battery connections from coming loose due to vibration during driving, which could interrupt power supply. 2. Keep the battery surface clean: Owners should regularly clean dust and dirt from the battery cover to prevent the vent holes on the filler caps or plugs from being blocked. 3. Frequently check the electrolyte level in the battery: During charging and discharging, water in the electrolyte will gradually decrease due to electrolysis and evaporation, causing the electrolyte level to drop. If not replenished in time, it will shorten the battery's lifespan. 4. Charge the battery promptly: The battery should be charged immediately after being discharged or before stopping use to avoid plate hardening, which can reduce the battery's service life.

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