So if anything vape-like remains after the approval process, the best to hope for would be a mod that uses a proprietary swappable battery pack. Sort of like what's used on camcorders (DSLRs as well, but those are tiny, well, so are most in the retail camcorder market compared to the larger HD cams used by news networks that are damn big and heavy). And those usually use proprietary chargers. No using your Canon battery pack on a Hitachi camcorder. Or like that for cordless power tools (which already use 18650s), but obviously not of that size, that also require their own chargers. It would certainly tie you into a brand, and if that brand is smart, the pack would be interchangeable with their different mods. I guess you can solve the battery charging issue by in mod charging only, hopefully with USB C as the new standard. But that would mean having more than one pack and tying up a mod just to charge a few batteries if you wanted to travel with backup. Maybe separate chargers would make sense, like we use now, but without the ability to charge any type of battery you're likely to select.
Yet RC and drone enthusiasts get to use Lipo's that are more dangerous, although I'm not sure they can be brought on planes. Maybe that was just the hoverboard craze when they were banned after igniting in overhead storage bins.
See? I typed all this, had to take a phone call, and all that typing was a waste. I don't care, I'm hitting post reply anyway.
Yeah, what
@Rossum already said