This is what these were for -

http://www.horizonhobby.com/Products...235#reviewsTab


I believe the reason they're discontinued is they're illegal for sanctioned racing. If you're a top flight racer, maybe you could see some effect from pre warming lipos to optimum temps, but I'm betting its slight. If this was a big deal, it would be discussed a lot, and its not.

About the only lipo related temperature discussions you see involve what temperature to store them at long term or running/charging them when its cold where you're running.