A battery

noun

Electronics.

1. an electric battery for heating the filament or cathode heater of an electron tube.

Word History and Origins

Origin of A battery¹

First recorded in 1920–25

Example Sentences

A battery of physical and memory tests, baselined against individual pre-season scores, is used in unclear cases to decide whether a player has suffered a concussion or if they can return to the field.

From BBC

A battery consists of two electrodes -- the anode and cathode, typically made of different materials -- as well as a separator and electrolyte, a chemical medium that allows for the flow of electrical charge.

From Science Daily

A battery made from zinc and lignin that can be used over 8000 times.

From Science Daily

Unfortunately, when a pacemaker battery fades, you can’t just go to the drug store for a Double A battery.

From Los Angeles Times

A battery can be charged flexibly, using renewable energy at times of the day with low demand for power, he said.

From Seattle Times