I have a Seigeli 20 watt [with a 26650 tube from VariTube. I use mnke IMR 26650 3400mah for that.And a Seigeli 30 watt . aesthetics is subjecttive just like E-Liquid Flavors. I have been using thesr batteries for the 30watt and for my Mechs-https://www.youtube.com/watch?v=Bb4nj91as9k. I never build below .5 ohm and try to keep builds for my regulated devices about 1 ohm. or higher . Not a Cloud Chaser or super sub ohm builder obviously.