iRobot Roomba Series 500, 600, 700, 800, and R3 Battery
Amazon.com - iRobot Roomba Authentic Replacement Parts - Roomba 1800 Lithium Ion Battery - Compatible with Roomba 960 895 890 860 695 680 690 675 640 614
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DC 14.4V 1800mAh 26Wh 1800LI Replacement Parts for iRobot Roomba 1800 Lithium Ion Battery- Compatible with Roomba 960/895/890/860/695/680/690/675/640/614 - Walmart.com