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Synergy Digital Vacuum Cleaner Battery, Works with iRobot Roomba 4000 Vacuum Cleaner, (Ni-MH, 14.4V, 3000 mAh) Ultra High Capacity Battery - Walmart.com - Walmart.com
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4900 iRobot Self-Charging Home Base 4931 (Compatible with iRobot Dirt Dog, iRobot Roomba 400 Series and Discovery Series)
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