Brand New - GP130AAM4YMX Visonic Powermax Express & PowerMaster 10 Alarm Battery 99-301712. GP130AAM4YMX Visonic Powermax Express & PowerMaster 10 Alarm Battery 99-301712 The 99-301712 Visonic back up battery is suitable for the PowerMaster and Powermax Express Control Panel. 4.8V 1300mAh P/N: 99-301712 - GP130AAM4YMX