New 1800LI Li-Ion Battery for iRobot Roomba 500 600 700 800 900 Series 595 601 660 680 690 770 790 850 860 870 880 890 960 - Walmart.com
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen