I'd recommend a
Flightpower 2s pack . Lipo pack that isn't over-rated and they have awesome performance, the MA packs are questionable with continuous discharge ratings... might not be able to handle dual 50 amp motors. This pack will save you 20oz. and it should run for 20 min
The timmy - Revo 3.3 MM 9XL 4s , Rustler MM 4600 3s
The ferty - Dual velineon Revo 3s, Rustler velineon 3s