Generic 10.8V 56Wh 6-Cell Battery for Compaq 6720s 6730s 6735s 6820s 6830s Compaq 550 610 (P/N: HSTNN-IB51 HSTNN-IB52 HSTNN-XB51 HSTNN-XB52 451085-141 451086-121) Lithium Battery

10.8V 56Wh 6-Cell Battery for HP Compaq 6720s 6730s 6735s 6820s 6830s Compaq 550 610 (P/N: HSTNN-IB51 HSTNN-IB52 HSTNN-XB51 HSTNN-XB52 451085-141 451086-121) Voltage 10.8V, Capacity 5200mAh/56Wh, Number of Cells/type 6, Colour Black, Compatible part number/s HP 451085-141, 451086-121, 451086-161, 451568-001, 456864-001, 456865-001, 491278-001, 451086-421, GJ655AA, HSTNN-IB51, HSTNN-FB51, HSTNN-IB52, HSTNN-OB51, HSTNN-XB51, HSTNN-XB52, HSTNN-LB51, 513129-421, 500764-001, DD06, HSTNN-I49C, HSTNN-I48C, HSTNN-I50C, HSTNN-I54C, 451086-122 Can be used with the following device HP Compaq Business NoteBook 6720s/CT, Business NoteBook 6720s, Business NoteBook 6730s, Business NoteBook 6730s/CT, Business NoteBook 6735s, Business NoteBook 6820s, Business NoteBook 6830s Compaq 550, 610, 615 HP 550 Note: For those who are looking for replacement battery for HSTNN-OB51, please make sure our battery’s shape is similar to your original HP battery’s and check your laptop model to see if it matches with one of the fit models we list out above.