(physics) A form of electrochemical storage cell in which electrolyte flows between connected tanks; the direction of flow being opposite when the cell is charging and discharging; used to store electricity from intermittent suppliers such as wind farms.

A hen kept in a small cage or battery.

(weaponry) In firearms and artillery, having a condition in which a live round is at least partially in the firing chamber and capable of being fired, but is not properly secured by the usual mechanism of that particular weapon.

(law, idiomatic) The combination of two violent crimes: assault (the threat of violence) and battery (physical violence). This legal distinction exists only in jurisdictions that distinguish assault as threatened violence rather than actual violence.

plural of battery mate

The time that a battery lasts

Synonym of battery-powered

fitted with a battery or batteries, which provide(s) the power to operate the device.

plural of battery booster

(literally) Acid used as electrolyte in a battery, usually sulphuric acid. / (military slang) Coffee.