Rechargeable Battery for Irobot Roomba Compatible with Original Batteries: Irobot APS 4905, Tenergy 11701, Tenergy 11709 Type: Replacement Battery Chemistry: Ni-CD Voltage: 14.4V (Compatible with 14.8V) Capacity: 2500mAh Power: 36Wh Compatible with Original Batteries:iRobot APS 4905, Tenergy 11701, Tenergy 11709 Compatible with iRobot Models: iRobot Discovery Series iRobot Dirt Dog? Models