The reason I want an 18500 version is because it can still be as small as the 14500, and only has to be approx 6mm wider on the Batt box, along with the power of 2 x 18500 Batts. Making this SGT VV the meanest Baddest Mutha in the land. 2 x 18650 would be to large in my opinion, but having 2 x 18500's would keep this little Mutha the power punching machine it is yet giving it a better power cell source then the 2 x 14500 system . Making it the ultimate little unit ! Ya I know it already is but this would really give & make this set up La Machine ! Also a 6ml bottle could be added possibly,,,,,,,,,,, J,, I really really would love to see you make this 2 x 18500 VV SGT La Machine, even if it's down the road a bit.