The act of beating or pounding. Law The unlawful and unwanted touching or striking of one person by another, with the intention of bringing about a harmful or offensive contact. An emplacement for one or more pieces of artillery. A set of guns or other heavy artillery, as on a warship. An army artillery unit, corresponding to a company in the infantry. An array of similar things intended for use together: took a battery of achievement tests. An impressive body or group: a battery of political supporters. Baseball The pitcher and catcher. Music The percussion section of an orchestra. Electricity Two or more connected cells that produce a direct current by converting chemical energy to electrical energy. Electricity A single cell, such as a dry cell, that produces an electric current.