Compatible Model CS03XL Battery for HP Elitebook 745 G3; HP EliteBook 745 G4; HP EliteBook 755 G3; HP EliteBook 755 G4; HP EliteBook 840 G3; HP EliteBook 840 G4; HP EliteBook 850 G3; HP ZBook 15u G3; HP ZBook 15u G4. Compatible P/N. CSO3 CS03XL HSTNN-I33C-4 HSTNN-I33C-5 HSTNN-I41C-4 HSTNN-I41C-5 HSTNN-IB6Y HSTNN-UB6S 3ICP6/65/79 800231-141 800513-001. Battery Type Li-polymerVoltage: 11.4V Capacity: 48WH ; Cells: 4-cell; Color: Black with Two Free Screwdrivers. 100% New from Manufacturer. Overcharge and Overdischarge Circuit Protection;Over-temperature and Short-circuit Protection; Up to 500 recharge cycles over the life of the battery. 90-day money-back guarantee,1 year warran.