I was having the same problems. My IMU calibration was stopping at about 95% every time. Then I finally twigged that screen was asking me to pick up the drone and hold it at various angles ( much like a compass calibration without the turning) to finish the process. Worked perfectly with my IMU...
I have just flown my P4P about as close as I should get to working wind turbines, from over half a kilometre (1/4 mile) away, with no radio interference at all. The drone performed perfectly.
I have just bought a similar unit and it works really well. I can now charge three P4P batteries and the controller in one hour. I've had a look around and can't see any information that would suggest these chargers are detrimental to the batteries life.
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