I love the Mini. I use it all day every day at work because it's small and pocket-able. I leave the full size at home. In all honesty if I were to do it over again I would have gotten a second mini instead of the full size. Battery lasts me all day with moderate vaping on a Kayfun or Nautilus around 1.6 ohms running 12.5 watts. Once and a while I take a dripper to work and then I definitely have to plug it in at some point. The general consensus on FT is that they are two 800 mah lipo batteries. 1600 mah isn't too shabby, especially if you're not vaping at high wattages.
I love the Mini for its size mostly. With a small topper like the 22mm IBTanked Halfling below it's an unbeatable setup when you want lots of features and a small footprint.
Lol, you can tell it gets lots of use, full of dust and dirt and the J wrap is peeling off.
I'm going on six months with both of these and they are still both going strong. I haven't had a single issue yet.
I think little drippers look great on it too.
Ok, that's enough Fasttech pron for now.