High Capacity 14.4V 3000mAh Replacement Vacuum Cleaner NI MH Rechargeable Battery for iRobot Roomba 500, 600, 700, 800 Series|battery for irobot|rechargeable batterybattery for irobot roomba - AliExpress
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Amazon.co.jp: Gakkiti Roomba Battery Compatible with 500, 600, 700, 800, 900 Series Replacement Roomba Battery for Long Time Operation, irobot Roomba 14.4 V Battery, Roomba Compatible Battery, 14.4 V, 3500 mAh, Large