Going to pop mine in the battery compartment too on a dymo white\black label (M2 Pro) as i’m sure the rules state it just needs to be accessible without special tools and I don’t think your fingers to release the battery clips counts as special. Also covers the visible on the ground as it is on top when the battery is out.
Mine are all in plain sight, on top of the MP in front of the battey, on the legs of the P4P, and on the side just below the battery cap of the Inspire.
Not that anyone will see them, they haven’t been out in months so will probably be sat in the house for the next few
I agree that you don’t need a special tool to remove the battery but it also can’t be read when the aircraft is on the ground if the battery is still in it, which is more than likely should it need to be read by someone not knowing how to remove the battery.
For someone of average height, 3mm text at ground level just isn’t legible… so that part is just bollox in any case.
So, whilst they’re kneeling down to get close enough, they can just remove the battery. #Simples