... friendly6. Low self discharge7. No memory effect8. Battery for iROBOT Roomba 400 Series ReplacementFeatures Charges up in 3 hours ... Roomba Original, Roomba Pro, Roomba Pro Elite, Roomba Dirt Dog, Roomba Discovery, Roomba Discovery SE, Roomba Red, Roomba Sage ... run-time than original Roomba batteries Replacement rechargeable battery for iRobot Roomba 400 Series, Discovery Series and Original models ...