Please provide source. Especially given that you would want to preserve some form of water resistance. Meaning you either (a) have the entire back be removabl

Please provide source. Especially given that you would want to preserve some form of water resistance. Meaning you either (a) have the entire back be removable or (b) a battery injection mechanism similar to a Leica SL3. Both of which would seem to need far more than 1% extra volume.