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iRobot Roomba 521 Battery
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Amazon.com - 14.4v NiCD Battery for iRobot Roomba 521, 531, 534, 536-2 Pack -
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User manual iRobot Roomba 521 (English - 19 pages)
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Amazon.com - 14.4v NiCD Battery for iRobot Roomba 521, 531, 534, 536-2 Pack -
User manual iRobot Roomba 521 (English - 19 pages)
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