One of the gentlemen who works at my local B&M's that I've become friendly with is building dual battery mech box mods. He let me try his with a pretty low subohm build (.1 something or another) and I have to admit it was pretty good. I normally stay within .25-.6 for most of my builds (on LG's and Sony VTC4's). I asked him about the safety range on a dual battery box mod and I didn't really understand the answer. So assuming I'm using my LG's in one of these boxes, do I still need to stay in my .25 safe range, or does having two battery's change things up a bit? My primary interest in one of these boxes is the additional battery life for when I'm out an about at a bar, casino, or some other such place where regular access to my charger isn't going to happen. Obviously I know I can get sigelei 100w or IPV3, but they both seem to require 30 amp batteries which are becoming difficult to come by, and to be honest, not 100% sure how to best build for the high wattage VW box mods. I think I just prefer the mech mods for the time being.