14.4v,3500mAh Ni-Mh Extended Battery for irobot roomba 880 vacuum cleaning robot,irobot roomba 870 Roomba 650 Roomba 595 Replacement Battery for iRobot R3 500, 600, 700 & 800 series 14.4V APS Battery Replacement Battery for iRobot R3 500, 600, 700 & 800 series 14.4V APS Battery 14.4V,3500mAh Ni-Mh Replacement Battery for Roomba iRobot R3 500,600,700&800 900 Series. Extended Battery,Compatible with Irobot Roomba 500 series 500 510 530 531 532 533 535 536 540 545 550 552 560 562 570 580 581 582 585 595 600 620 630 650 660 700 760 770 780 790 800 870 R3 80501 4419696. Ni-MH battery made with high quality battery cells,APS battery compatible with all 500 series Roomba. Fully charge before use (at least 12 hours). Higher Capacity 3800mAh,it runs for well 1.5 to 3 hours with no problems after fully charge. Make sure to run this battery fully down a couple of times to properly condition it. Best to unplug the docking station and push the docking button in insure complete depletion.