noun A container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power. (battery power) A fortified emplacement for heavy guns. (anti-aircraft missile batteries) A set of units of equipment, typically when connected together. (a battery of equipment to monitor blood pressure) The crime or tort of unconsented physical contact with another person, even where the contact is not violent but merely menacing or offensive. (any act which puts a person in immediate and reasonable fear of battery) The pitcher and the catcher in a game, considered as a unit.