Generic iRobot Discovery Series, Dirt Dog Replacement Battery Fits Roomba Battery (Grey Color) 4905Product Features- Comparable to iRobot Roomba Advance Power System (APS) model 4905. - Up to 75 minutes run time - Measures 179mm x 51mm x 52mm (7 x 2.2 x 2.3 inches) in size - 14.4 Volt, 2.4Ah Capacity, NiMH battery. This is a replacement generic iRobot Discovery series NiMH battery. The maker of these batteries are in fact the same maker of the genuine iRobot batteries, and come off of the same assembly line as the genuine, more expensive iRobot name brand batteries. This smaller capacity NiMH replacement battery has less run time then the yellow colored battery, but is also more economical. The 14.4 Volt battery will still give your Roomba the same power, but will need to be charged more frequently then the yellow battery. GoVacuum offers 100% Money Back Guarantee on Fit and quality of replacement Roomba batteries. This battery will fit iRobot Discovery Series models including iRobot Roomba Red, iRobot Roomba Sage, and iRobot Roomba Discovery robots, as well as the iRobot Dirt Dog model. Also fits iRobot Create models.