For a single 18650, you'd need to get a Samsung 20S. You could also use the Sony VTC5A in a pinch. LG HB 2, 4, and 6 would also work, but with shortened run time.
A better bet would be to look at 20700 or 21700 cells. The Sanyo 20700A, Sanyo 2070C, Samsung 30T, and Samsung 40T would all suffice.
UNLESS you were looking for a complete mod with an internal battery in which case there are many, many devices rated to 75 watts...