Amazon.com - iRobot Authentic Replacement Parts- Roomba 1800 Lithium Ion Battery- Compatible with Roomba 960/895/890/860/695/680/690/675/640/614 -
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