Replace 7.2Volt 1.7AH Battery 1400668 for RYOBI HP61K, HP721, HP721K, RY721, RY721K2 Drill Remarks: Only Charge with Ryobi 4400100 AC Adapter. Color: Black | Rate: 12.00 Wh | Weight: 484.70 g Capacity: 1700mAh | Dimension: 90.80 x 57.50 x 105.00 mm Battery Type: Ni-Cd | Voltage: 7.20V (Compatible with 7.40V) Please ensure the product(s) fits the brand, model, part number and dimension of your device.