If I were setting up that airplane I would increase to a 2700 mah LiFe battery and run the ignition with a Tech Aero IBEC. The ignition draws approx 1000 mah at full throttle. The standard analog servos you are using draw very little current, the only real variable is your smoke pump but I would imagine 1000 mah or less. The 2700 would safely give you an hour of flight time. If you want more safety margin you could go with a bigger battery or top off every three flights.