It is true that my landing skids may add a little over the stock ones but to be fair I believe that the weight of my carbon legs would be extremely close or less than a stock landing set plus dual battery trays.
The results, while specific to my own Phantom, can easily be extrapolated to other temps and slight variations in weights. The interesting thing is the difference in relative increase from a 2200 to a 5000 using a, what I consider to be, a typical Phantom.
The Flight was terminated at the battery warning indicator (with stock settings and after voltage calibration), well after a few seconds. Throughout the video you see me punch the throttle a few times to see if I got the Red LED during power surge indicating a softening battery, we never saw that Once. I think that is a product of the higher capacity and 30C rating resisting voltage drop associated with current surge.
Being that the battery is a cheap Turnigy it would not surprise me to discover it had a higher capacity then the label infers LOL
At the end of the day, my Phantom gave me 11 minutes of soft flight with a 2200 and 14:30 with a 5000 on the same day, same conditions and same setup. That's all I'm saying.
I will try two stock 2200's in parallel next, the resultant capacity will be less but the weight a lot lower, perhaps I will find a sweet spot. I am also interested to try vision props although I am sure that will only make a small difference, perhaps 1 or 2 minutes (You can't get something from nothing). But right now I don't care if other guys and especially battery tray vendors are claiming 20, 25 or even 30 mins, I know that can't simply isn't true with a single 5000.