Synergy Digital Vacuum Cleaner Battery, Compatible with iRobot Roomba 562 Vacuum Cleaner, (Ni-MH, 14.4V, 4000mAh) Ultra High Capacity, Replacement for iRobot VAC-500NMH-33 BatterySpecifications:Battery Chemistry: Ni-MHVoltage: 14.4VCapacity: 4000mAhCompatible with: iRobot VAC-500NMH-33 BatteryWorks for: iRobot Roomba 562 Vacuum Cleaner and many more