No Surefire accepts an 18650, they are built for primaries, may accept a 17670 though. I don't know if the lights really run on one cell and how long they do, the 2-cell are built for 2 x CR123A, beware of 2 x RCR123 if you're not sure it accepts 8,4V.
I run mine on primaries only, for the rest I have some marvellous hosts from Oveready with dropins from Nailbender and Malkoff, these run perfectly on an 18650, but there's not much "Surefire" in there anymore...