PowerSmart&reg; 7.2V 3000mAh Ni-MH 1311145, 1400668 Battery FOR Ryobi HP61K, HP721, HP721K, RY721, RY721K2 (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 Dimension: 90.80 x 57.50 x 105.00 mm ||Weight: 536.70 g Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension (mentioned above) of your device.