Roomba battery 14.4V 3500mAh Type: Replacement Battery Chemistry: Ni-MH Voltage: 14.4V (Compatible with 14.8V) Capacity: 3500mAh Power: 50.4Wh Capacity: 3500mAh Power: 50.4Wh Compatible with iRobot Models: iRobot Discovery Series iRobot Dirt Dog? Models