The HP VV09XL is a lithium-ion battery with a capacity of 90Wh (equivalent to 8110mAh) and a voltage of 11.1V. It's designed to replace the battery in HP ZBook 15 G3 and G4 series laptops, as well as the ZBook 17 G3. It's a black, 9-cell battery, and is compatible with the part numbers VV09XL, HSTNN-DB7D, HSTNN-C87C, 808398-2B1, 808398-2C1, and 808452-001.