Roomba 900 Series Original Battery (Lithium 3300mAh)
ORIGINAL Lithium Ion Battery 1800 mAh for iRobot Roomba 1800LI | eBay
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
iRobot Roomba Battery for Select 600 and 900 Models