ISELECTOR Lithium Replacement Battery For iRobot Roomba 500,600,700 and 800 Series, 4400mAh 14.4V Ultra high capacity 4400mAh lithium battery has 46% more capacity than the original battery with 3000mAh Perfectly compatible with the models of iRobot Roomba 700 and 800 series. And fully compatible with the original Roomba charger No memory effect + low rate of self-discharge ensure long operating life and high capacity of the battery Save money-lithium battery offers more cycle times than NiMH/NiCd batteries (1 Lithium = 4 Ni-MH/Ni-Cd batteries) Built-in over-charge, over-discharge, over-voltage, over-current, and over-temperature protection