Thomas is using the epower 14650...he draws too long on it and it blinks at him. The batteries do last a long time though. It's a nice unit to have. Still think you should be penny pinching for a ProVari though. It is totally worth it.
What kind of atomizer/cartomizer does he use?
I was thinking that I would be happy with the ProVari but now I'm not so sure high voltage vaping is for me. My dad just got a Lavatube with what I believe is a 3 ohm lava tank and I tried it out on 4v, 4.4v, 5v and 6v. Aside from the temperature change above 5v I couldn't tell a difference in the amount or taste of the vapor.
I've been using an Smoktech dual coil, low resistance (1.5ohm) cartomizer and love it.
A couple days ago I broke out my Smoktech dual coil, low resistance (1.5 ohm) tank and love it a little more. I made the mistake of loading it with a bad juice when I first got it then didn't use it for a month after rinsing it out. I loaded it with the CC coffee then powered through the taste change from bad to coffee. That one puts out a little more vapor than the cartomizer.
What I'm getting at is now I have a good flavor in my low resistance tank and I put it on the Lavatube, ran through different voltages and just don't see any advantage over the 3.3v that the eGo battery puts out.