There is nothing wrong with making your own ecig mods, but please do a little research first. Stay away from consumer grade alkaline disposable batteries, like shown in this ‘How to Not Make an Ecig Video’. Also stay away from Radio Shack type lithium rechargeable batteries made for cameras and other consumer electronics, as they are not designed for the high amp demands of the electronic cigarette. A good place to learn about batteries is, Battery University and we’ve also discussed it in a blog as well.
Google is your friend… Please don’t be dumb!