I have been using two of those for a couple of months and they are OK.
I have been getting flight times of around 10 minutes on my P1 which is quite heavy at a little over 1.4Kg with the multistar onboard.
Also running 2D gimbal,FPV and T motors.
They do produce a little more power,torque wise,than the 2700mAh batteries I also use.
The 2700mAh batts give me flight times of 7 to 8 minutes.
I think my Phantom is at a weight that makes it hard to get more from these batteries.
At a guess,a standard P1 would probably fly for at least 12+ minutes.
You will have to cut out the battery opening to fit the multistar and the extended battery door helps too.
