I received a battery error twice " Damaged Cell " while flying in Sport Mode with the battery below 50%. It doesn't effect the flight. No RTH...  was able to fly home with the flashing Battery Error. Battery % read the whole time. I didn't think to screen shot. Don't know Apple...  
Thoughts,
Cell #4 resting is .03 volts below the rest. It is .08 Volts below the rest under load. i have discharged and recharged. It has been charged 13 times. Seems pretty normal to me ?? I haven't monitored the voltage yet but think it sets when 1 cell gets .1 volt below another. This is also normal with RC Boats. Large Amp Draw.
I have never set this error in P Mode.
Weak cell in battery or normal high amp draw when battery is low on charge ???

Hello turbojoe69 ,could you please provide a screenshot of the battery page.I'll help to check it.
Please follow the method to capture a screenshot:
Hold down the Sleep/Wake and Home buttons at the same time and release them. You should hear a camera shutter sound and see a white screen indicating the screenshot was taken.

[img]https://forum11.djicdn.com/data/attachment/forum/%5BURL=http://s284.photobucket.com/user/joeo69/media/IMG_00021_zpsxal3vq1j.png.html%5D[/URL][img]https://forum11.djicdn.com/data/attachment/forum/%5BURL=http://s284.photobucket.com/user/joeo69/media/IMG_00011_zpsm9eoeovt.png.html%5D

The second time i had the battery error i was flying Litchi. It gave the detail that it was cell #4. I have never seen it more than .08 volts low in flight.

DJI support wait time was very short, unfortunately the person answering it knew zero about R/C anything. No diagnostic questions at all. Must be training new help..
Best Buy stepped up and handled the situation outside of the 14 days. There tech at least knew what a LiPo battery was and about cell balance. 99% sure it was just a flaky cell. They replaced the whole bird.
No hate toward DJI, your birds rock !!!  Customer support is always going to be a work in progress. I just hope the service techs have a bit more experience. (:

turbojoe69 Posted at 2016-9-3 04:50
DJI support wait time was very short, unfortunately the person answering it knew zero about R/C anyt ...

I'm glad to hear you were able to get the issue addressed.

10 Flights on the new bird, am happy to report no issue at all in Sport mode, even with the battery below 50%

turbojoe69 Posted at 2016-9-8 06:19
10 Flights on the new bird, am happy to report no issue at all in Sport mode, even with the battery  ...

Good to hear, thank you for the update.