Also make sure you have a fuse in the circuit that is well below the max discharge that the battery can give for safety.

As kenny says you will not need a lipo bigger than 2 to 3 Ah. Running boner in fights even when it's going the full 3 minutes doesn't take more than 1.5Ah out of the battery. I use a 4Ah lipo but that's to get the discharge for the brushless motor.