Hi i wonder if anyone can help.  I have an iPhone  6 plus to which has no faults with the battery at all except recenty when connected to my p4 after 10 mins flight on a 70% phone battery it suddenly says low battery, then extra low battery then suddenly the phone will switch off, this to me is such a serious error.  So i have just purchase a dji mavic, great nice piece of kit, 7 mins flight flattened my iphone battery and it turned off. O M G Whats happening???.
  Strange thing is when i close everything down and switch the phone back on the battery is not fully discharged and is approx 10-12% left and my phone never goes off unless it gets to 1%.   Please help as this is a serious falt somewhere and im pretty sure its not the phone.

Have a read through This, it would seem that there are some phones with problems.

You can go to apple store or online and verify if your phone is on the reacll list. I have Iphone 6S and Iphone 6S+ and nver had an issue. Mavic flying I loose about 15% with each battery. P4P I loose around 18% per battery.

It's something you may want to look into. If you can confirm that it's not the battery, please let us know.

I have no problems with battery at all unless i use the p4 app i never had any faults on the p3 app that i just sold.  

My Iphone7plus charges while I am flying.. I guess I am lucky..