Energizer A544 / 4LR44 6V alkaline battery. This battery is commonly used in door alarms, key fobs, bite alarms, cameras, car alarms and many other devices. Replaces: A544, 4LR44, 3131, PX28, 28A, PX28A, 476A, K28, V28, 4G13. Battery Voltage: 6V. Battery Composition: Alkaline. Battery Diameter: 12mm. Battery Length: 26mm. Single use Alkaline battery Voltage 6 Volt. Common uses such as Dog training collars, car alarms and security devices, photographic equipment. Also Known as A544, 476A, V28PX, PX28, 28A PX28A, 28PXA, 4LR44, 476A, 4G13, 4SG13, GP476A, K28, V28, PX28AB, RPX28, L1325, 1414A, V4034PX or 3131. The Energizer A544 battery works in medical devices, dog collars and more.