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A battery

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

Origin of A battery

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for a battery

Historical Examples

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

    Letters of a Radio-Engineer to His Son

    John Mills

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