Metapo High Capacity Lithium Replacement Battery for iRobot Roomba 500, 600, 700 and 800 Series. 14.8V, 4400mAH, Lithium Rechargeable Battery PREMIUM BATTERY: Metapo 4400mAH high quanlity battery Li-Ion battery made with premium Samsung Cells. It gives you 46% longer run time than 3000mAH Roomba battery. COMPATIBILITY: Fully Compatible with iRobot Roomba 500, 600, 700 and 800 series robot cleaners EXTENDED LIFETIME: This battery has much longer lifetime (lasts about 800 charging cycles), so you don't need to replace battery as often. Get a great battery and save money over a long run! WORRY-FREE GUARANTEE! We are US based company. In case you are not completely satisfied with the product, just return it within 30 days for a full refund. ONE-YEAR WARRANTY: This product carries 1 year warranty.