Exell 412A Alkaline 22.5V Battery NEDA 215 Compatible With 15F20,BLR122,V72PX NSN # 6135-00-643-3485Exell 412A Alkaline 22.5V Battery (Eveready 412 or BLR122) is an Alkaline Compatible With for the once-popular Carbon Zinc battery that was commonly used in AVO meters and vintage knight transistor testers. Being Alkaline, the 412A Compatible With will last longer than the original. It is widely used in vintage collectible transistor radios, such as the Regency TR-1.Specifications Voltage: 22.5V Amperage: 180mAh Chemistry: Alkaline Length: 1.03in (26.2mm) Height: 2.00in (50.8mm) Width: 0.63in (15.9mm) Terminals: Socket.