Turnigy LiFEPO4 packs

[jpoprock]

So guys... what can I expect from two 2s 4500mah Life Packs by Turnigy if sticking them in my Summit or Emaxx for winter driving? Both trucks have a single Titan 775 and the EVX2 ESC's.

I understand that Lipos don't like cold weather, and it's COLD here. But I can wrap them in a "blankie" to keep them warm if need be, since they are so thin.

What would be my run time and torq expectations when running the Life packs vs 2s 30C Turnigys, vs a 7 cell NiMH pack that is comparable? If the Life packs I'm looking at really won't give me good run times, or will be wicked slow, than I'll just stick w/ the Lipos and take my chances. Either pack is about the same price. I'm wanting runtimes for winter driving, because I don't want to have to mess with coming in and recharging all the time. Cuz once I come in from the cold, I won't want to go back out! And really.... 30min of snow driving is long enuff for me to get my RC fix for the day anyway.

Thanks!
jason