I believe guidance along the lines of "High power batteries are dangerous items which may injure you if you put more than one of them in your pocket with your keys. Oh, and by the way, please do not blame your electronic cigarettes which had nothing to do it with it when you injure yourself. It also may be an idea to spend a small amount of time researching how to use other things like ovens and cars as well".
I'm teasing and you probably don't want to use anything after the first sentence ... adding something to the end of "Always store your batteries in a plastic or rubber container in which the batteries can not move or contact each other or any other metal" with a rider like "Failure to do this may cause an explosion" might be a good build