Tenergy New Extended Life 1000 Cycles 14.4V 3850mAh NiMH Battery For iRobot Roomba 900 800 700 600 500 Series

More Cleaning Per Charge. The high capacity 3850mAh replacement battery offers a longer run time than other 3000mAh battery. Cost-Efficient & Less Replacing. Built to have up to a 1000 recharge cycle life span. It will maintain its performance consistently, eliminates the need for frequent replacements. Direct Replacement. A direct drop-in replacement requires no additional modifications or tools.