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14.4V 4000mAh Ni-MH Battery for iRobot Roomba 400 Series, fit 4000 4100 4105 4110 4130 4150 4170 4188 4210 4220 4225 Battery - AliExpress
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iRobot Roomba 400 and 4000 Series Vacuum Cleaner Replacement Battery by Chrome Battery – chromebattery
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