Compatible Models:

HP/Compaq 550
HP/Compaq 6720S
HP/Compaq 6735S
HP/Compaq 6780S
HP/Compaq Business Notebook 6720S
HP/Compaq Business Notebook 6780S 

Compatible Part Numbers:

HSTNN-IB52, HSTNN-OB51, NBP6A73, STL-CHA-SON
451085-121, 451086-161, 451545-251, 451545-36, 456864-001
GJ655AA, 491278-001, HSTNN-FB51, HSTNN-IB51

Specification:

11.1v, 4400mAh, 48Wh, 6-cell,Lithium-Ion  (Li-Ion)

** We have been supplying Laptop batteries for 12 years, in our opinion these products are the best third party / generic units available, they are manufactured in Hong Kong using the best quality grade A cells from Panasonic and E-one Moli Energy **

Order by 4pm for next working day delivery (When showing in stock)