Compatible Brand For HP Model No HP 6520 Number Of Cells 4 Capacity 4000 mAh Compatible Models Business Notebook 6520s, Business Notebook 6530s, Business Notebook 6531s, Business Notebook 6535s, Compaq 511, 515, 516, 610, 615 Series, d530, dc7700, dc7800, dx7400 & HP, 540, 541 Series Compatible Parts No 451545-252, 451545-261, 451545-322, 451545-361, 456623-001, 456864-001, 484785-001, 500014-001, 572186-001, 572189-001, DD06047, DU06047, HSTNN-DB51, HSTNN-I38C, HSTNN-I47C-A, HSTNN-I47C-B, HSTNN-I50C-A, HSTNN-I55C, HSTNN-I64C-4, HSTNN-I65C-4, HSTNN-OB51, HSTNN-OB51T, HSTNN-XB51, KU530AA, NBP6A73 Warranty 1 Year From Service Center