PowerSmart 7.2V 3000mAh Ni-MH Power Tools Battery for Ryobi HP61K, HP721, HP721K, RY721, RY721K2, Compatible Part Numbers: 1311145, 1400668 (Only Charge with Ryobi 4400100 AC Adapter.) Remarks: Only Charge with Ryobi 4400100 AC Adapter. Battery Type: Ni-MH Voltage: 7.20V Capacity: 3000mAh Color: Black||Brand New Dimension: 90.80 x 57.50 x 105.00 mm||Weight: 536.70 g||1 year warrant Please ensure the product(s) that you are going to buy fits the brand, model and part number of your device.