I use the 2200 mah 25C GensAce. They fit snug under the Align canopy. You may have to put the battery a little higher on the battery mount for it to fit. As far as the motor goes you want to know the wattage of it, that's the number that will determine your amp draw on the battery. I have a 3000Kv motor rated at 300 watts, with the 11.1 volts the battery supplies I have just over 27 amps of draw. 300w/11.1v = 27.03 amps (rounded).
Also the GensAce battery that I have has a 5c charge rate, but I am limited to 4.5 amps due to the charger. I also fly about 4.5 minutes and end up putting back in about 1400 mah give or take. I also changed my connectors to ultra deans, I do not recommend doing this if you are new to soldiering.