Lead-acid battery refers to a battery which uses lead oxide and spongy lead electrodes with sulfuric acid as an electrolyte. Generally, several cells are put in series to form a battery, such as for an automobile.
The group of cells is generally in a polypropylene container. The advantages of lead-acid batteries are commercial availability, recyclability and low cost. The disadvantages are that they are heavy and the amount of energy stored per kilogram is less than for other types of batteries.