EPC 9 Cells 6600mah Li-Ion Brand New Laptop Notebook Replacement Battery for Hp Compaq 6520, 6520s, 6520p, Business Notebook 6530s, 6531s, COMPAQ 510, 511, 516, 515, HP 540, 541 HSTNN-OB51 451545-361 456623-001 HSTNN-DB51 KU530AA 500014-001 484785-001 laptop battery