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
Upgraded 6800mAh Lithium Li-Ion Battery for iRobot Roomba 500 600 700 800 series | eBay
Roomba® 1800 Lithium Ion Battery | iRobot | 15.9.1.2
Upgrade 14.8V 5000mAh Lithium ion Battery Compatible with iRobot Roomba 900 800 | eBay
Amazon.com: for iRobot Replacement Parts Roomba 1800LI 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 (1800mah) : Home & Kitchen