The battery which uses sponge lead and lead peroxide for the conversion of the chemical energy into electrical power, such type of battery is called a lead acid battery. The lead acid battery is most commonly used in the power stations and substations because it has higher cell voltage and lower cost.
A lead-acid battery consists of a polypropylene casing; lead terminals and positive and negative internal plates; lead oxide; electrolyte, a dilute solution of sulfuric acid and water; and plastic separators made of a porous synthetic material.