I hope you can see the attached picture... i have a small ego c upgrade, a medium ego c twist and a large ego c twist. Now I know that I control the voltage output on on the twist and I just have to figure out what to set it on but for the small ego c upgrade, sadly it's not a pass through, I have no clue which "tank" and what resistance "ohms" to put on it.. seems like what I use on my twists are fine then when I try to use the same on my small upgrade it starts to leak... i was using a tobac bcc with replaceable "wics" but that's when my problems started with my 3 new batteries (I used to have2 pass throughs, which I miss very much) now I'm using an evod bcc tank and my twist is on 3.6 but it still sounds like it's going to start leaking.. HELP!!! I asked an owner of a vape shop but he was talking to me like I was stupid for not knowing