A car battery is a crucial element in an automobile's electrical system, supplying the necessary power to start the engine and energize various vehicle accessories. Typically composed of lead-acid, these batteries consist of lead dioxide and sponge lead in a sulfuric acid solution, housed in a durable plastic case. When the driver turns the ignition key, the battery provides a burst of electricity to the starter motor, initiating the engine's combustion process. Subsequently, the alternator takes over, powering the vehicle's electrical systems and recharging the battery. Regular maintenance, such as checking fluid levels and terminal cleanliness, is vital for optimal performance and longevity. While a car battery's lifespan averages three to five years, factors like driving conditions and climate can influence its durability. Proper disposal, often through recycling programs, is crucial due to the lead-acid composition, ensuring environmental sustainability.