6-cell 511883-001 Replacement Laptop Battery for HP G50, G60, G61, G70, G71 Notebook Series, HP HDX 16, 16T, X16, X16-1000 Notebook Series, HP Pavilion DV4, DV5, DV6 Notebook Series and Compaq Presario CQ40, CQ41, CQ45, CQ50, CQ60, CQ61, CQ70, CQ71 Notebook Series Premium Quality, 100% OEM Compatible.