RE: Mini Funtana Set Up
For just fun flying and aerobatics, even at that weight it flew well. Landings were straight and it showed no signs of tip stalling provided you kept the speed up on approach. But then most any plane will stall if you get it too slow on landing.
As to Li-Po's, the higher the MAH you can carry, the longer the flight times for a given current draw. Once in the air, the prop unloads, and the current draw goes down to about 75% of the static (on the bench) current draw. In addition the RPM of the motor increases by about 10% after the prop unloads. This allows you to run pretty close in MAH to what the current is.
For example if you are drawing 25 AMPS, you would want to have a 2500 MAH pack. You could get by with a 1200 to 1500 pack if they are rated at 20C. Most packs, off the shelf are 10C meaning they cannot handle more current than 10 times the MAH rating of the pack.
A 20C 2500 MAH Pack can theoretically handle 50 AMPS continuous. I have tried this, and found that the packs tend to get hot and the capacity (overall life) is drastically reduced.
If Li-Po's are never taken below 3 Volts per cell, never get hot under load or charge, and if stored for long times take down to about half charge, they can give in the range of 600 cycles. For each of the abusses of these parameters, the life of the battery goes down.