Just dropped in.. nothing much to add to this conversation except I vape .6 ohm @ 30W on one and two battery mods. Been using LG HE4's . The odd thing I will say, is I get a longer lifespan with three single batteries than with a two or three battery mod. ... What I mean, is I will only go through two batteries using a single battery mod, having to swap during the day once. Sometimes I have to swap a second time. But with a two or three battery mods, I will have to swap out sets a bit later during the day, but definately once/day. So, with single battery mods, I last all day with three batteries... but I need four or six with the other mods. Kind of confusing, but I hope you get the idea.