Amazon.com: HQRP 3300mAh APS Battery Works with iROBOT Roomba 531/533 / 536/537 / 551/561 / 563/564 / 571/577 / 578/600 / 611/790; 800/880 Series [Vacuum Cleaning Robot] Replacement : Home & Kitchen
Amazon.com: NASTIMA 14.8V 5000mAh Lithium ion Replacement Battery Compatible with iRobot Roomba 960/895/890/860/695/680/690/675/640/614, Replace The Original 1800mAh Lithium ion Battery : Home & Kitchen