I bought packs from XPS, 5000 ma 6s packs 2 for 12s. The price they were selling them for fit my budget.

I have averaged any where from 5 to 6 minutes. I usually full power on the runway pass and then half throttle on the back side.

We flew the Falcon at the Nov AZ Jet Rally and it got pushed to over 7 plus minutes after flying almost full power for over 5 minutes. Then we got hung up with a turbine going dead stick. We ran out of juice on the final push to the runway and reset the esc to get the final boost for landing. Batteries were really hot, but you could still handle them, I put back into them 4700 ma and did not damage any cells. Pretty good batteries that XPS sold.

Normal flights I have been putting back around 3300 to 3800 ma. I have been still working on the exit diamater for the thrust tube. Since mine is only 6 inches long, I do not get the full results of a full lenght thrust tube.

Other brand of batteries may produce better flight times.

Clay