The Exell 411A 15v Alkaline Battery (NEDA 208, 10F20, BLR121) not only offers efficient, long-lasting performance, but it also functions as a replacement battery for a wide array of standard as well as unique applications. These uses differ considerably. It can be used for vintage camera equipment to sophisticated medical testing equipment. The 411A battery is an alkaline replacement for carbon zinc batteries that were commonly used in AVO meters. Being alkaline, this battery will last longer than its carbon zinc counterpart. The Exell 411A 15v Alkaline Battery (NEDA 208, 10F20, BLR121) is widely used in vintage collectible transistor radios, early model 8 AVO meters, and Mk III AVO meters.