Laptop Battery for Laptop HP 550 1.100% compatibility . 2.High stability and safety. 3.RoHS and CE certificate. Fit laptop Battery Part Number: HSTNN-IB62, 451085-141, 451086-121, 451086-161, 451568-001, GJ655AA, HSTNN-IB51, HSTNN-IB52 Fit Laptop model: HP 550, Business Notebook 6730s/CT, Business Notebook 6720s/CT, Business Notebook 6735s, Business Notebook 6820s