Specification:
Battery type: Li-Polymer
Voltage: 11.1V (Compatible with 10.8V)
Capacity: 4000mAh
Cell: 6 Cells
recharge cycles： 500 
Operation time: Around 2-3 hours

Compatible Models：( Ctrl + F for fast search ur laptop model)
HP EliteBook 840 G1 
HP EliteBook 740 Series, HP EliteBook 740 G1 Series ,HP EliteBook 740 G2 Series
HP EliteBook 745 Series ,HP EliteBook 745 G1 Series, HP EliteBook 745 G2 Series
HP EliteBook 750 Series ,HP EliteBook 750 G1 Series, HP EliteBook 750 G2 Series
HP EliteBook 755 Series ,HP EliteBook 755 G1 Series ,HP EliteBook 755 G2 Series
HP EliteBook 840 G1 Series ,HP EliteBook 840 G2 Series 
HP EliteBook 845 Series, HP EliteBook 845 G1 Series, HP EliteBook 845 G2 Series
HP EliteBook 850 Series, HP EliteBook 850 G1 Series ,HP EliteBook 850 G2 Series
HP EliteBook 855 Series ,HP EliteBook 855 G1 Series ,HP EliteBook 855 G2 Series
HP ZBook 14 Series ,HP ZBook 14 G2 Series, HP ZBook 15u Series
HP ZBook 15u Series ,HP ZBook 14, E7U24AA Mobile Workstation

Compatible Part Numbers：

CM03XL CM03 CM03050XL 
HSTNN-IB4R HSTNN-DB4Q HSTNN-L11C-5 HSTNN-LB4R 717376-001 716724-421 716724-1C1 (3ICP7/61/80) 

716723-271