So, here is my new case: my iphone battery level get weird after using DJI Go app.
For example: fully charged phone, 20 min of flight, and i got like a 30% of phone battery in the end of the flight.
Phone battery have a nice health, except using Go app (more than 5 hr of HD Youtube vid's for testing — no strange behavior).

Any suggestion?

Hi , Yaonya
Please try turn off the "Hardware Decode" in"General Settings" .

The Go App is very processor intensive and uses a lot of power, this is normal.

DJI-Patrick Posted at 2015-12-1 11:03
Hi , Yaonya
Please try turn off the "Hardware Decode" in"General Settings" .

Ok, Patrick, i will.

yaonya Posted at 2015-12-1 21:24
Ok, Patrick, i will.

Or maybe you can try another device .