The HP OA04 2600mAh battery is a 4-cell, 14.8V Lithium-ion battery with a capacity of 2600mAh, equivalent to 38Wh. It's designed to be a replacement for similar batteries on HP and Compaq laptops, including models like the 15-G012DX, 15-G019WM, and 15-R011DX. The battery is CE, FCC, and RoHS certified for safety and is designed with protection against overcharging, over-discharging, and other potential issues.