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

To do so connect the grid as in Fig. 115 to the positive terminal of the A-battery.

From Project Gutenberg

We shall call the battery which heats the filament the “filament battery” or sometimes the “A-battery.”

From Project Gutenberg