BTI L77991-002-BTI 11.55V 56WHR LI-ION BATTERY 28Y92UC, L77991-002, HSTNN-DB90, L77991-005, L77622-2C1, L77622-2C2 ELITEBOOK 850 G7, ELITEBOOK 850 G8, ELITEBOOK 855 G7, ZBOOK FIREFLY 15 G8Power through demanding days with the BTI L77991 002 BTI 11. 55V 56Wh Li Ion battery. This 3 cell replacement battery is engineered for long lasting performance in HP EliteBook models, including the 850 G7, 850 G8, and 855 G7, as well as select ZBook configurations. Its designed to be a seamless, high quality OEM replacement option that delivers dependable run time, improved energy density, and reliable safety features. With a capacity of 56Wh and a