Amazon.com: NASTIMA 14.4V 4400mAh Lithium ion Replacement Battery Compatible with iRobot Roomba 600 700 800 900 Series 614 615 675 680 690 694 760 780 790 805 880 890 895 960 980 985 : Home & Kitchen
Cameron Sino 5200mah Battery For Irobot Roomba 614, 615, 640,652,665,670,671,675,677,680,681,671,675,677,680,681,685,690,691,695 - Digital Batteries - AliExpress
Amazon.com: VI VINTRONS Battery Replacement Compatible for IROBOT Roomba 614, Roomba 615, Roomba 640, Roomba 652, : Home & Kitchen