i thought this'd be more appropraite here, since it's about mods rather than batteries and also to avoid having to explain again and again: this doesn't concern mechs or mech-like use on reg-mods. basic question: aside from the obvious increase in possible power output, is a series set-up essentially the same as a single battery in terms of duration/capacity? nuances: i don't go above 60w willingly (some coils and liquids force me to but once i'm out of them i wouldn't). and i am about to make the shift to rta. otherwise i do have a 21700 single battery mod and the only thing stopping me from picking up the swag ii is__ that it's an 18650! i have tried a single 18650, and it's fine for mtl-ing, but dl-ing is, for me, by definition, a chain-vaping affair_ so 18650 doesn't make much sense. though not fired yet, i recently got the vaporesso gen, because of the stellar review and because i assumed: two batteries, more life. in other words, i have no interest in it's +100w potentials. this is before i'd read up on battery set-ups, which explained the different results of parallel and series. if i understand correctly, if the reason for adding batteries is capacity, rather than output, a series circuit is a sixth wheel in the trunk of a stranger's car in a locked garage on the other side of town. sell the gen?