Battery with thin, cardboard exterior. 3/4 red (with white and blue letters); 1/4 blue (with white letters) (Top). Eveready No.482 (45 volt) radio "B" battery 45 volt, 3-pin socket on top of battery. No date stamp or marking visible.
Early radios were generally powered by batteries, such as this New Zealand made Eveready battery, rather than plugged into a socket in the wall. Homes in the 1920s, when radio broadcasting in New Zealand began, did not have electricity. Radios required more than one type of battery, an ‘A’ and ‘B’, and sometimes also a ‘C’ battery. The ‘A’ battery supplied the tube filament in the radio’s valves and the ‘B’ battery, like this Eveready example, was the high voltage supply.
Union Carbide (New Zealand) Limited. Battery - Radio "B", F510.2001. The Museum of Transport and Technology (MOTAT).