Battery type 3 will display %. The non DJI battery setting has no % display. To use setting 3 you have to use Assistant and find the parameter 'battery_type'
Percentage is there especially important on the P4 where non-DJI battery eliminates the % reading. DJI also got rid of the mAh display because they think people are too stupid to understand it, so before I discovered this additional battery setting we had to fly the P4s on voltage only.
Flight...
I fly all my DJI stuff on battery type 3. Stock is 1, non-DJI is 2. That eliminates all auto landing and warnings. Fly at your own risk and come in low over soft terrain!
30,584ft, P4A, stock battery, stock RC with windsurfer, parameter mod, 31 degrees tilt, full throttle. Battery starting at only 4.28v on the stock DJI charger.
I'm impressed your 1.5mm hex driver could get that much grip!
Those machine screws don't take much torque and have blue threadlocker from the factory. No worries about rattling loose in flight.
DJI Phantom 4 Shell Replacement
Since cracks normally form on the lower half around the vents it's an easier job just to change the bottom shell. I also have a theory that if you glue the vents to the shell it will give more strength to the high stress areas.