BTI notebook battery compatible with HP ZBook Firefly 15 G8, EliteBook 850 G7 / 850 G8 / 855 G7. OEM P/N: 28Y92UC, L77991-005, HSTNN-DB90, L77622-2C1, L77622-2C2, CC03XL CC03XL - Please note: HP has two CC03XL batteries in its portfolio with different form factors. Please use the additional OEM P/Ns to verify compatibility or contact your account manager. We recommend: Advance exchange for this product is available directly through Origin Storage throughout the 18-month warranty period.