Lithium Replacement Battery For iRobot Roomba 400 4000 Series, DirtDog, Discovery, Scheduler, Burgundy and Create, 4400mAh - UL&CE Certified Battery Component Meets UL and CE Safety Standards Lasts 4X longer than iRobot Roomba and all aftermarket Ni-MH replacement batteries Longer operating time and battery life: 4400 mAh + more than 800 charge cycles (Original battery offers 200) WORRY-FREE GUARANTEE! You will be 100% satisfied or we'll give you a full refund. FULLY compatible with the original charger. For more product information, visit www.LithiumPowerInc.com