Well, I run a mm5700 on 3s in my losi xxx-s. It was about 40*f when I decided to go do some speed runs at the local(not really) huge parking lot. Just starting off my lipo(maxamps 3s 4k) was at 67*f. I radar-ed in at 33mph; then ran slowly tried to warm up the lipo and gradually hit 40mph. After, I decided to chuck the lipo on the windshield defroster in my car. Warmed it up to a nice 95*f then clocked in at a nice 57mph. Warming the lipos really do help.

I was talking to one of my boat racing friends(brushless of course) and he preheats his lipos to about 110*f before starting, supposedly it helps the electricity flow better....

Bye