Genuine HP Compaq 8510P, 8510W, 8710W Laptop 8-Cell 14.4V 4400mAh Battery HSTNN-CB30 398875-001 410311-251 398876-001 395794-741 398682-001HP Compaq 6720T, 7400, 8200, 8400, 8500, 8510P Laptop 8-Cell 14.8V 4400mAh Battery 395794-001 398876-001 398875-001