old thread but some valuable info here... I also wanted to share a recent experience.

I have been storing my lipos in lipo sacks in my garage for the past 10 years. This past week it got up to 105f outside, probably around 110f+ in my garage, ...i went to open my lipo sacks today, all, ALL of my batteries are puffed to the point where the casing is totally split open. I had about 8 lipo batteries, ...sucks!

I have a beer fridge in the garage, I put a temp gauge inside and have adjusted it to stay at a constant 50f ...so from here on out all my lipos will go in a lipo sack in the beer fridge. I figure the constant temp (through winter/summer) plus never being exposed to 110+ degree temps ought to be good for them.