What does it mean when the car battery light is on?

[DelJoel]

The battery light on the car indicates a fault in the charging system. At this time, the battery is not charging but only discharging, and you need to stop the car immediately because all the electricity used in the car comes from the battery. When the battery is exhausted, the car will automatically shut down and cannot be driven. The battery indicator light is used to display the working status of the car battery, and its color is usually red or yellow. When you turn the key and the vehicle performs a self-check, this indicator light will come on. After starting the car, the indicator light will automatically turn off. The car battery, also called a storage battery, is a type of battery that works by converting chemical energy into electrical energy. Batteries are divided into ordinary batteries, dry-charged batteries, and maintenance-free batteries. Usually, when people refer to a car battery, they mean a lead-acid battery. The normal service life of a car battery varies from 1 to 8 years, which is closely related to the condition of the vehicle.