Amazon.com: GUSHINE 3500mAh NiMH Battery for iRobot Roomba R3 500, 600, 700 & 800 Series, 3.5Ah 14.4V Advanced Power System (APS) Battery Replacement 500 550 630 650 770 780 880 and More : Home & Kitchen
Amazon.com: iRobot Roomba Authentic Replacement Parts – 3300 Lithium Ion Battery - Compatible with 900 and Select 600 & 800 Series : Home & Kitchen
Amazon.com: TREE.NB Long Life Battery for iRobot Roomba R3 500 600 700 800 900 Series 500 510 531 535 540 550 552 560 570 580 595 610 620 650 660 700 760 770 780 790 800 870 880 900 : Home & Kitchen
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery Accessories - Compatible with Create 2, Scooba 450, Roomba 500 600 700 & Select 800 Series Robots : Home & Kitchen