Maybe check to see what apps you have on your watch. maybe some of them are always connected with GPS. I know my face watch has weather on it like the tep and it will show me the current weather like it's sunny,cloudy, rainy. i know that it constantly gets updated so its getting that info somehow. i also have the "Maps" app on my versa. on my versa in "Maps" app under setting there's a setting for how offend to refresh your versa location the choices rang from 1 Min - 1 hours. i'm sure if you have an app like that running in the background consistently pinging your location it could be draining that battery faster than normal.
I don't work for fitbit i just saw your post and thought i could try to help.
