4400mAh/48Whr 6-Cell Li-ion HP Compaq Business Notebook 6720s 6730s 6735s 6720s/CT 6730s/CT 6820s 6830s Replacement Battery fits HSTNN-IB62 451085-141 451086-121 451086-161 451568-001 GJ655AA HSTNN-IB51 HSTNN-IB52 w/a USB 2.0 ALL in one Card Reader (Equivalent Battery)