New up to 4% per hour battery drain

Same issue here since Saturday July 17. Charged the watch Friday Afternoon after a run using BT for music. Saturday night watch was at 5% battery with no activities recorded on the watch and Pulse OX off. Had to charge the watch again Monday 10% battery, and watch went from 23% around 2:00 am to dead at 5:00 am today (Wednesday). Powering off, soft reset had no affect on battery drain. In 40 minutes this morning battery went from 95 to 92 % in regular watch mode/no activity recording. 

OK, so, after losing 70%+ of my battery in 48 hours only doing one 4 mile run and one 1 mile walk, I called Garmin again.  Said, hey, your engineer put logging on my watch, and I told him what happened within the last 48 hours, thinking they could look at the logs and maybe see what happened.   Guy put me on hold for a good 5-10 minutes, came back, and offered to send me a new watch.  He didn't tell me who he spoke with or what that person said, but, I'm getting a replacement this Friday (doing an express replacement).  I'll report back if that fixes my issue.  

With phone next to bed and BLE on, sleeptracking on but no PulseOx, acceptable battery use (7%) over the ~16 hours since last night's run. In my case everything points to the BLE phone connection. It has to be off, OR the phone has to be in reach.

Just checked the battery drain while the watch is Off. With normal Power Off battery drain is the same - 5% per hour. With hard reset (press light button 10 sec) battery drain is 0%. Seems the battery is OK, but what do they do when the watch is off via normal Power Off? Garmin started mining coins?

Very interesting observation!

(If someone finds this post as a result of a query about "sleep" - no need to read on, this is not about human sleep).

I'm guessing, but I'd expect a'true power off' would, after saving the current state and switching most of the processor(s) off or putting it/them in deep sleep mode, only do some timekeeping and checking for keypresses to wake it up. That takes so little power it can stay for months in that state.

So I guess (again..) that 'normal power off' is more like a suspend: current state still in memory, screen off, most/all sensors off/in deep sleep, and able to resume quicker than after a true power down. That should be way more energy-efficient than 5% per hour! Perhaps something doesn't enter low power mode when it should.

(A good article about the different types of sleep modes is here.)

It would be nice if we'd have more information on things like: Is this issue registered, is it worked on, when could a fix be expected? Is there a workaround? 

The new watch fixed all my problems.  Sleep and battery are both normal now.  10% drain a day doing nothing, just under 10% an hour with GPS/GLONASS activities.   Had it for 48 hours.  So we’ll see how it ages, but, looking good so far.  It’s a Rev D, just like my original one. 

Good to hear that's fixed. What a quick replacement!

What firmware is on the watch? 7.20 as well? BTW, how do you see it's a Revision D? 

Mine is still totally fine as long as the phone connection is disabled during the night. 

It shipped with 6.2, but I updated it to 7.2 before use.  You can see the revision on the box itself.. that said, maybe it's the "revision D" of the box and not the watch?  LOL.  But no, all's well!  

After Factory Reset and sync via Garmin Connect and with stock settings (watch face, widgets etc.) the battery drain is the same 5% per hour. I give up.