My Galaxy watch was fine one week ago. I was able to wear it most of the day. Exercise etc and still have enough battery to do me most of a second day. Now even if it is not being used I will get 12 hours max. Watch is not even 2 years old. Anyone else with this problem?
Your sensors might be broken.
Type *#0*# on the phone dial in your watch and go to sensor and run the self test on barometer and gyro. If those ones are failing it might be causing an extra strain on your watch.