Vendors either based in or with a large presence in the US will have to adapt to whatever regulations come along. Having a removable battery is not much of a guarantee considering how many of the "E-cig horror stories" are related to a battery being in a metal container or a pocket full of keys and change. The battery would need to be permanently affixed and an electrical disconnect would also need to be present to make it as safe as possible. Protection inside the battery would also be a good idea, but how practical that would be while keeping things small is a whole other story.
Willie, keep in min that istick has to be at least as tall as an18650 plus a few mm for the top and bottom caps as well as being at least 19mm internal diameter plus the thickness of the body, doubled of course. For an "outside" mod I love my Invader Mini. Relatively small, water resistant, dust resistant and shock resistant. Heck, I vape in the shower with it!
Willie, keep in min that istick has to be at least as tall as an18650 plus a few mm for the top and bottom caps as well as being at least 19mm internal diameter plus the thickness of the body, doubled of course. For an "outside" mod I love my Invader Mini. Relatively small, water resistant, dust resistant and shock resistant. Heck, I vape in the shower with it!