1-2X 6800mAh Akku für iRobot Roomba 500 600 700 800 620 660 790 780 880 900 SS | eBay
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