Flylinktech 14.4v 3500mAh NiMH Rechargeable Battery Replacement for iRobot Roomba 400 4000 Series, DirtDog, Discovery, Scheduler, Burgundy and Create 14.4v 3500mAh NiMh Replacement battery Replacement battery for IRobot Roomba 400 405 410 415 416 418 Series 4000 4100 4105 4110 4210 4130 4232 4905 14.4V 3500mAh 14.4v 3500mAh Ni-MH Rechargeable Battery Replacement for iRobot Roomba 400 405 4000 4100 4105 4110 4130 415 4150 Compatible with all 4xx or 4xxx models. Including Roomba Red, Sage, Dirt Dog, Schedulers, Discovery. Fuel gauge onboard: Displays remaining runtime for less downtime on the job. Highest quality standards,Integrated microchip prevents overcharging & lengthens battery life. 100% Compatible with original manufacturer equipment.Longlasting, reliable.