The time that a battery lasts

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

Synonym of battery-powered

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

plural of battery booster

plural of battery acid

A rechargeable battery that integrates a solar cell with battery power storage. / An assembly of solar cells, interconnected for higher voltage or current. (Analogy to cell and battery.)

plural of battery hen

plural of battery life

(dated, electronics) A battery used to provide the plate voltage for a vacuum tube.