Topbatt Roomba Replacement Battery 3000mAh NiMH for iRobot Roomba 500, 600, 700 series Plastic and Metal Imported This battery is made up of NiMH cells, and is rated at 3.0Ah capacity. Compatible with original manufacturer equipments and chargers. The original Roomba charger is fully compatible. Real capacity,long cycle life and low internal resistance. 1 year warranty.