@Facer_Official and and anyone else who's Samsung phone battery is not displaying on any Facer face.
PLEASE READ THIS! --you may want to advise this to anyone else having the problem. (This only applies to Samsung devices with the "Device Maintenance" app.)
Regarding my previous posts about the phone battery not updating on watch faces...
Ensure you do NOT have the Facer app added to "Always Sleeping Apps" within the stock Samsung "Device Maintenance" app. Add the phone Facer app to "Unmonitored Apps."
2 days now since making that change, and the phone battery is now updating in (almost) real time on the watch faces. It's been consistently close at all times, and it IS updating now, which it wasn't prior.
I've not noticed any phone battery drain from white-listing Facer. In fact, under "Battery Usage" Facer is not even showing. When checking the actual battery usage of the app, I'm showing 0% per hour.
I'm using a Gear S3 and Samsung S8.
It isn't, and was not a problem with the Facer app, it was a problem with adding Facer to Always Sleeping Apps.
Hope this helps someone!