What does the battery light on the car mean?

[SanJuliet]

When the battery light appears on the car, it indicates a fault in the battery system. The possible causes are: 1. Battery aging; 2. Loose battery connections; 3. Alternator failure; 4. Engine belt failure; 5. Insufficient voltage; 6. Fuse or relay failure. The maintenance methods for the battery include: 1. Avoid overusing the battery; 2. Regularly clean the positive and negative terminals of the battery; 3. Periodically check the vent holes on non-maintenance-free battery covers to prevent blockage; 4. Avoid low battery water levels; 5. Start the vehicle once a week to charge the battery during long-term parking. The functions of the battery are: 1. Powering the engine starting system, ignition system, and vehicle electronics; 2. Supplying power to the car's electrical equipment when the engine is off or at low idle; 3. Absorbing voltage spikes in the electrical system to protect the car's electronic devices.