Amazon.com: for iRobot Roomba S9 9150 + S9+ 9550 Robot PN ABL-B Sweeper Rechargeable Lithium Ion Replacement Battery 4INR19/65-2 14.4V 3300mAh/48WH : Home & Kitchen
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Amazon.com: Areotek 4500mAh Extended Life iRobot Roomba Replacement Battery for 500 600 700 800 Series Robots : Home & Kitchen