Falcon - just as an idea of what the battery capacity is like in relation to flying time ... a new fully charged 4.8V 600 Mah battery will easily give you 4-5 flights (maybe 6 even) of 7 mins each at sportman level (not your heavy 3D flying) with standard servos. I run 6V 1,100 Mah NiMh batteries, I get a lot of flights and I still have a very safe margin.