Scota, Charge your batteries. Fly for ten minutes. Charge your batteries. Write down the mah returned to the battery. Do this six times. Add up the six numbers. The total is the number of mah you have consumed in one hour of flying. If you fly for one hour each time you go flying double this number for a safety factor for your battery capacity. That "C" number is the charge rate. It has nothing to do with the discharge capacity. It sounds like you are have one battery pack for you RC and ignition. This adds a significant load to the battery. Most guys use a separate battery pack for the ignition. It's a more reliable configuration.If the BEC fries you'll be out of luck. Dan.