PowerSmart 7.2V/7.40V 1700mAh Ni-Cd Replacement RYOBI Power Tool Battery for RYOBI HP61K, HP721, HP721K, RY721, RY721K2, HP722, Compatible Part Numbers: 1311145, 1400668(Only Charge with Ryobi 4400100 AC Adapter) Remarks: Charge with Ryobi 4400100 AC Adapter. Battery Type: Ni-Cd Voltage: 7.20V (Compatible with 7.40V) Capacity: 1700mAh Color: Black Dimension: 90.80 x 57.50 x 105.00 mm ||Rate: 12.00 Wh ||Weight: 484.70 g ||1 year warranty! Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension (mentioned above) of your device.