This pack will fit perfectly. Get 2 pairs.
http://hobbyking.com/hobbyking/store...dProduct=11614
These turnigy packs are pretty sweet. I have the 30c version in my flux and they barely get warm.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.