This is a certified brand new replacement battery for select Dell Inspiron laptops. This battery replaces the M5Y1K that shipped with your Dell laptop.
Compatible Part Numbers: 453-BBBR,HD4J0,M5Y1K,WKRJ2,GXVJ3,HD4J0,K185W
Compatible Models: Inspiron: 3451, 3558, 5451, 5455, 5458, 5551, 5555, 5558, 5758,Vostro 3458, 3558
Very happy with the new battery. Works great. Only way it could be better were if it were cheaper. But it was a good price.