HP ProBook 640G1 645 

Number of Batteries :1 Lithium ion batteries required.

type: Laptop Battery

Battery Cell Composition: Lithium Ion

Unit Count: 1 Count

Voltage &Capacity : 10.8V 55WH 5100MAH

Reusability :Rechargeable
Full compatible with your original battery ,brand new from Professional Manufacturer,

Certificates: Certificates: ISO9001, RoHS, FCC, CE, CB certified ,grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability

Expected operation time: 2-3 hours. This may vary, depending on device type and the way it is used.

Fits models: HP PROBOOKS -HP CA06 CA06XL 718677-421 718678-421 718755-001 718756-001 HSTNN-DB4Y HSTNN-LB4X HSTNN-LB4Y HSTNN-LB4Z HSTNN-LP4Z