RE: The right Li-po?
kevromeh,
Which battery you choose will depend on how many Amps the motor is drawing. I'm not 100% sure, but I think we need to figure on 12 Amps.
What are the C ratings of each of those electrifly batteries? The C rating times the capacity of the pack will tell you how many Amps it's capable of handling. If the C rating times the capacity equals 12 Amps, then it'll work.