I can’t find a way to show the battery charge level on the remote except for the home screen. When you are actually using the remote in an activity to control devices, there doesn’t seem to be way to tell the battery level aside from X-ing out of the current activity and going back to the home screen.
There appears to be enough room to include the battery level indicator in the same size and location as seen on the home screen, to each of the activity screens.
Since the battery is probably the weakest part of the remote 3 (in my opinion) and it often doesn’t last a full evening, it would be useful to see the charge level while on an activity screen, so you can return it to the base and start the extremely slow recharging before the battery dies completely.