I use the Aspire CF VW 1100 mah battery that came with the Nautilus Mini tank. Evod 2 650 mah battery with the Aspire Maxi Clearomizer. Evod clone 1100 mah battery with an Aspire Maxi Clearomizer.
I prefer the Aspire CF VW with the Nautilus Mini. I love that I can change the watts and the air flow. With that said, most of the time (mon- Thurs 8am -4:30pm) I use the evod 2 setup or the evod clone setup because I'm at work and I can put the smaller ones in my scrub top and no one knows they're there. Once 4:30 comes my aspire CF VW comes out.
I don't use the evod 2 Clearomizer that came with the battery because it is a dual coil and I feel like I have to hit it hard just to get some vapor. I use the Aspire Maxi tanks because they give me good flavor, they hold 1.5 ml of fluid and they're easy to clean.
Just my preference! Hope this helps!