Replacement NI-CD Battery for iRobot Roomba 400 405 410 415 416 418 4000 4100 4210 4905 Vacuum Cleaner Type: Replacement Battery Chemistry: Ni-MH 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