HP Business Notebook 6520s Battery Replace The Following Part Number: 451545-361, 456623-001, 484785-001, 500014-001, 572186-001, 572189-001, HSTNN-DB51, HSTNN-OB51, KU530AA540541 HP Business Notebook 6520s Battery Fit With Following Models: Business Notebook 6520s, Business Notebook 6530s, Business Notebook 6531s, Business Notebook 6535s