Same here.... got 12 hours of use, doing nothing intense. Just wearing it. 5 pro lte. Connected to my phone the entire time , no wifi or lte being used.
Other users have reported that wiping device cache has helped with battery issues. Please follow the steps below to do that:
Recovery: Power off watch. Power on watch while holding both side buttons at the the same time. When you see "Samsung" with "rebooting...." under it, quickly tap the upper button (power button) 3x. Once menu appears, navigate with power button to "Recovery" (highlighted in blue) then press and hold power button. Now in recovery, navigate with bottom button to "Wipe cache partition". Press power button. Navigate to "Yes" and press power button.
If the issue with battery persists, please submit an error report.
We appreciate your contribution to the Beta Program.
