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14.4v 12800mah Replacement Ni-mh Battery For Irobot Roomba 500 600 700 800 Series For Roomba 880 760 530 555 560 581 620 650 - Rechargeable Batteries - AliExpress
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Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen