Brand:HP
Fit model:Compaq 6720s Series
Replace for:HSTNN-IB52
Cell QTY:6 cell
Voltage(V):10.8V (can fit for 11.1V)
Capacity:4400mAh
Color:Black
Weight:320g
Type:Li-ion
Warranty: Three year warranty

Replacement For:

HSTNN-IB62      451085-141       451086-121
451086-161      451568-001       GJ655AA
HSTNN-IB51      HSTNN-IB52

Fit Machine Models:

HP 550 Series
HP 550

HP COMPAQ
Business Notebook 6720s     Business Notebook 6720s/CT 
Business Notebook 6730s     Business Notebook 6730s/CT 
Business Notebook 6735s     Business Notebook 6820s
Business Notebook 6830s