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.
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:
People all have a hardon for Li-poly batteries that require so much additional electronics and...