My friend uses 1 battery for everything on his Eflite 90mm Viper conversion, mainly because he has no space for another battery. Not sure how many flights he has on plane, but he has a little over 12hrs on the turbine (only been in this jet). And he has no issues with the battery. He is using a hi C battery, and he checks it every flight just to make sure. But he loves it.Straight 2S lipo for the turbine. BEC for the receiver and retracts. Not sure how he is handling the smoke system nor the Unilight system.