I have a couple TFV4 mini tanks and run them with the CLP2 and Q4 coils around 78 watts. Battery life is a bit short on a single 18650 mod, so run them on dual 18650 mods. The single is fine if I want something smaller when outside, but close to home, but if heading out for the day, I use a dual battery mod that will last for the trip. You could carry a spare battery (in protective case, of course) for a single battery mod, but some of the dual 18650 mods are close enough in size for me, it's easier to "carry the extra battery" in the bigger mod. Pretty much personal preference.
EDIT: Forgot to mention that on the single 18650 mods, that 78 watts I like are at or above the limits of the mod.