Here's a bit more info..
I'm paired with a 6+ 128GB
I reported earlier that the apple tech told me to let the battery die and that would re-calibrate the battery.
So I have been letting it go, here is an interesting thing...
The battery continued to drain at 10% per hour until I hit 28% left, at which point (still wearing the watch) I ran out doing errands and 5 hours later, I am at 11% which is a 3.5% burn rate!
I also noticed that during this time, since wiping the watch, rebooting the phone, and re-pairing, the heart rate monitor appears to NOT be measuring every 10 mins like it is supposed to.... I am wondering if the heart rate monitor has been the culprit? Although I am sure everyone else with good battery life has the heart rate monitor constantly monitoring...
Just some more info for those with the same issue.
I will report back tomorrow after the watch has died and brought back to life.