Why is the car battery light on?

[StJourney]

Car battery light on indicates a battery power loss condition. If the battery light illuminates before starting the car, it means the alternator isn't generating electricity and the battery isn't charging. The battery light serves as a warning for drivers to promptly inspect vehicle faults. Car batteries belong to a type of storage battery that converts chemical energy into electrical energy. Key precautions for battery usage include: 1. Avoid prolonged parking in open-air lots; remove and store batteries during long-term parking to prevent freezing damage. 2. During winter when engines are hard to start, each cranking attempt shouldn't exceed 5 seconds, with at least 15-second intervals between attempts. If the engine still won't start after multiple tries, check other systems like electrical circuits, ignition coils or fuel systems.