Right now I am using SI volt batteries. I have 3, and while I love this setup for the novelty of it being a "cig-a-like ;" I am a very heavy vaper. I am considering an ego style kit, and purchasing an ego twist type battery. But at the same time I want to skip the middle ground, and just buy myself a Provari. I know some people say skip it, get a reo. But right now mech mods don't really interest me that much.