Powerextra Replacement Battery for iRobot Roomba 500 600 700 800 &900 Series High Capacity Ni-Mh 3000mAh Replacement For iRobot 80501 Battery Brand new 3000mAh capacity, 14.4 volts high quality Ni-Mh battery cells. Replacement Vacuum Cleaner Battery for iRobot Roomba 14.4V 500 600 700 800 & 900 Series Vacumm Cleaner. The replacement battery is CE certified and tested by manufacturer to match OEM products. Rapid completion of the charging process without memory effect, convenient and fast charging. Easy install and it fits perfectly. Keep your Roomba cleaning up all the cat hair, cat litter and whatever else was on the floor.