First off, howdy, welcome to the fun. If you're considering buying this guy, I think it has a lot to offer. There are also some other excellent portable vapes around, you might want to spend a bit of time exploring them?
Anyway, while high temperature can be an issue, however I'm not aware of any overheating issues that might impact this. Perhaps you could enlighten me?
It gets hot for sure, but 'too hot to hold comfortably' and 'killing my battery' is a lot of degrees. A lot. High temperature versions of this kind of battery do fine at temperatures you can't hold on a bet. More over they are stacked up in the coolest corner. The electronics, in a hotter area, will take a dive before the battery is threatened. The LCD display before that. We're not really there even.
I expect mine will go several years (many hundred cycles) before I start noticing battery life going down. From then on it's a matter of how much I'll put up with. Much like a several year old laptop (which uses a similar batter as a rule).
OF