Replacement 9 Cell 10.8v 6600mah extended Battery Power Pack for Hp Laptop Computer Models: G72-b40sb G72-b45sb G72-b49wm G72-b50us G72-b53nr G72-b54nr G72-b57cl G72-b60us G72-b61nr G72-b62us G72-b63nr G72-b66us G72-b67ca G72-b67us G72-c55dx G72t G72t-200 G72t-b00 1 year warranty 9 Cells 10.8v 6600mah