In telegraphy, the source of power that actuates the telegraphic station recording instruments, as distinguished from the source of power that furnishes current to the line.

(electronics, of a device) Using a battery to maintain operation when not powered by the main electrical supply (e.g. during a blackout).

A stamp mill.

plural of battery cage

A voltaic battery in which the electrolyte is water. / (military) A battery nearly on a level with the water.

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

A battery whose purpose is, in addition to powering an electronic device, making the powered device permanently unusable once the energy runs out.

(historical, military, US) A group of cannons pulled by mules, used in 19th century warfare.

(psychology) The use of information from multiple batteries of tests in order to guide diagnostic decisions and to gain a fuller picture of an individual.

Several magnets placed with their like poles together, so as to act with great force.