A lead-acid battery is a type of rechargeable battery that uses lead dioxide and sponge lead as electrodes, with sulfuric acid as the electrolyte. It is commonly used in vehicles, such as cars and trucks, to provide the necessary power for starting the engine and running electrical systems. These batteries are known for their reliability and cost-effectiveness, making them a popular choice for various applications. However, they are heavier and have a shorter lifespan compared to newer battery technologies, such as lithium-ion batteries. Regular maintenance can help extend their life and performance.