Hi everyone and greetings from South Africa 
I was wondering if anyone has had this same issue and could help me?
I bought a P2 a few months ago, now I dont like storing batteries at maximum capacity for extended periods of time so I decided to run them down with the props off one chilly winter evening.
I ran down the first one and stored it away with no problems, upon plugging in my second battery I was greeted with the following problem...
When booting up the P2 I get constant beeping, red and yellow lights flashing (indicating a compass issue). I plug the P2 into the assistant software and I get an Error 27.
I have tried the following to remedy the problem:
I have tried to recalibrate in numerous areas around where I live.
I have tried the magnet around the compass trick (DJI told me to)
I have tried factory resetting the drone and redoing the firmware.
So far its a dead duck.
Here is a video:

I was wondering if anyone has had this same issue and could help me?
I bought a P2 a few months ago, now I dont like storing batteries at maximum capacity for extended periods of time so I decided to run them down with the props off one chilly winter evening.
I ran down the first one and stored it away with no problems, upon plugging in my second battery I was greeted with the following problem...
When booting up the P2 I get constant beeping, red and yellow lights flashing (indicating a compass issue). I plug the P2 into the assistant software and I get an Error 27.
I have tried the following to remedy the problem:
I have tried to recalibrate in numerous areas around where I live.
I have tried the magnet around the compass trick (DJI told me to)
I have tried factory resetting the drone and redoing the firmware.
So far its a dead duck.

Here is a video: