Amazon.com: 5.2Ah Ni-MH Battery Compatible with iRobot Roomba R3 500 600 800 900 Series Vacuum 530 550 560 620 630 650 800 870 : Home & Kitchen
Amazon.com: for iRobot Replacement Parts Roomba Lithium Ion Battery Compatible with Roomba 960/895/890/860/695/680/690/675/640/614 4376392 Series 4INR 19/65 14.4V 1800mAh/26Wh (3300mah) : Home & Kitchen
Replacement Battery for Roomba 500 600 700 Series APS Battery 555 595 620 630 650 660 790" - Walmart.com