It’s fine as long as you don’t plan on using your DJI warranty while the drone is still covered.
As for the third party batteries you're considering, it's hard to say how they'll perform compared to DJI's. I wouldn't assume all batteries from...
I would imagine that a lot of the 'scrutiny' would be avoided if it looked as though you'd been using it along with any other camera gear you took with you for the trip... and it wasn't still in the packaging.
I admit I didn’t read every post here and apologize if I’m being redundant. I don’t object to the FAA or even local law enforcement being able to identify my drone. What I DON’T like is the general public being able to know the exact spot I’m...