An automotive battery is a rechargeable power source that provides electrical energy to start a vehicle's engine and power its electrical systems. Typically, these batteries are lead-acid types, which consist of lead plates and sulfuric acid. They store energy chemically and release it as electricity when needed. In addition to starting the engine, an automotive battery supports various functions, such as powering lights, radio, and other accessories when the engine is off. It also helps stabilize voltage levels in the vehicle's electrical system, ensuring that all components operate efficiently and reliably.