Automotive batteries are rechargeable power sources used in vehicles to start the engine and power electrical systems. The most common type is the lead-acid battery, which consists of lead plates and sulfuric acid. These batteries store energy chemically and release it as electrical energy when needed. In addition to starting the engine, automotive batteries support various functions, such as powering lights, radios, and other accessories. They are typically located under the hood and require regular maintenance to ensure optimal performance. Over time, batteries can lose their ability to hold a charge, necessitating replacement.