ALL meanings of a battery
a bat·ter·y
A a - noun a battery the power source for the filaments of electron tubes in battery-operated equipment Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved. 5
- noun a battery an electric battery for heating the filament or cathode heater of an electron tube. 2
- noun a battery (dated, electronics) A battery used to heat the filament or cathode heaters of electron tubes. 1