Thanks for info. Personally I would rather carry an extra 18650, or in this case a spare Mini Volt LOL, than use the passthrough feature on any mod.I've been running the goblin mini on a mini volt for a couple of weeks now. I'm using double coils, but built it to .9 (the mini volt recommends that you don't build below .8 but it will take down to a .2 (I think)).
With the .9 coils at about 23 watts, I am getting 5-6 hours out of it. It is great for running errands, going out to dinner, that type of thing. You can use the mini volt as a passthrough, but I haven't yet.
Now I don't want any flak from anyone, I used the term "personally".