Iam using a 8C/KAN650/DOUBLE STICK/16A/MJST $ 17.60 $ from
http://www.cheapbatterypacks.com and I purchased the matching connector for the ESC a JST(BEC) Female RED $ 1.00
I installed the radio under the wing near mid fuse. I installed the ESC under the wing in front of the radio. I installed the battery on top for ease of replacement.