If you want to die an especially horrible death, buy your e-cigarette battery chargers from CHINABUYE.
These have been cleverly designed to explode any batteries you are silly enough to fit them to. They have no regulators. You have to guess how long it will take before they explode. And, if you happen to guess wrong, your house goes up in smoke.
Its an example of delightful Chinese quirkiness. Like the melamine the Chinese put in milk powder.
Heres a pic of what happens. The exploded battery (top) has been super-overcharged by the unregulated CHINABUYE battery charger (left) and exploded through the top end shooting flames and hot metal across the room. If you are lucky, your house does not go up in smoke and/or you dont lose an eye.
Sigh. No way of posting the pic here.