only thing i can advise with E cigs is, don't plug them into a USB to mains adapter, because its not very smart (learnt that first hand) i'd been charging my ecigs from my pc, but a buddy of mine bought a brand new e cig that came with 2 batteries, i took said one of said battery home with me after he gave it to me for free. i plugged it into my mains adapter and into the wall, got into my bed to sit and read a book whilst i waited for it to charge.around about ten minutes later KABOOM, the battery had exploded and showered my desk and floor in burning battery acid, luckily it exploded so violently all the acid instantly burned out and no fire was started, but man, the heart attack. my desk now has a small crater in it from the bottom of the battery blowing out and smashing into it. wonderful little things e cigs.