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 - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen