I think most of today's e-cigs are undervolted and have safeties built in, back when they were first starting it was Wild West out there, just a bunch of crap imported in bulk from China that tended to explode at the drop of a hat.
@Skv0ra, Never is always the best to get stuff from China if you're considering on getting the proper materials. Esp the batteries and I know that even importing batteries can be caught up in customs for obvious reasons.
People all have a hardon for Li-poly batteries that require so much additional electronics and equipment to charge, and even then they use fireproof bags to charge and store them in because they tend to go boom for no reason.
@Veho,
squishy lipos and knowing how to use standalone custom chargers, is NOT for your average Nerf herder brain to comprehend. Coming from 10th scale RCs - we know how to work em.