iRobot Roomba Series 500, 600, 700, 800, 900 and R3 Battery
irobot roomba 581 baterie – Heureka.cz
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
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Battery pack for iRobot Roomba 581 (4000mAh, 14.4V, Ni MH)|Laptop Repair Components| - AliExpress