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The role of batteries
In addition to starting the engine of an automobile, an automotive battery also supplies power to the lights and other electric equipment and serves as a backup to controllers and other types of computerized equipment. The electrical circuits of an automobile (one example)
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Batteries consist of a positive plate, a negative plate and an electrolyte, and deliver direct current electric power through a chemical reaction. When the electric power is applied externally the other way round, electric power can be stored in the battery.
The battery supplies power to the starter when starting the engine. When the engine is running, the alternator (generator) supplies electric power to the electric equipment, and the battery is recharged at the same time.