SpecificationsModel: TA03XL Voltage: 11.55V Capacity: 51Wh/4420mAh Battery type: Li-ion. Also comes with installation tools. Compatible Laptop/Notebook ModelsFor HP EliteBook 745 755 G4 Series Notebook. HP EliteBook 840 G4 848 G4 Series Notebook.HP EliteBook 850 G4 Series Notebook. HP ZBook 14u G4 Series Notebook.HP ZBook 15u G4 Series Notebook Compatible Part Number TA03XL CS03XL HSTNN-IB7L 854047-1C1 854108-850 996QA101H HSTNN-172C-4 HSTNN-175C-5 HSTNN-I72C-4 HSTNN-I75C-5 TA03051XL TAO3XL Purchasing Note: Due to the complexity of laptop battery models, you may not be able to accurately determine the model you need to purchase,Please open the back cover of the laptop to confirm the original battery model number TipsIf the new battery is not recognized during the initial installation, please reinstall and check if the interface is fully connected. Run the new battery down to 5% (not 0%), then top up its power and complete 3-4 power cycles to wake up the new batter