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I found that watchOS 6 was doing well with battery life and then all of the sudden it sunk. Within 3 hours mine would go from 100% to 85% in 3 hours. I have the 42mm Series 3 and I’m able to make it to 3 days on a single charge before getting to 10%.

I updated to 6.1 beta 1 and all is good now. So I think it has something to do with 6.0
 
From your other post:

“Same here. Today I charged mine full and unplugged it around 9am and I did hiking, walking and climbing for 3h30m and after 9 hours, my battery went down to 55%. What gives?“

I’m not sure what your expectations are, but that seems pretty reasonable to me. Apple promised 18 hours battery life, you have 55% after 9 hours.

And this doesn’t even take into account what I assume to be continuous activity tracking for 3.5-4 hours of that time.
 
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I regularly go hiking in the Lake District covering 10-15 miles over 4 hours with 4500ft of ascent and still have 35-50% battery left at the end of the day. I tend to carry my iPhone with me so it will use that for GPS. I consider that to be good going considering it is monitoring HR etc all the time during the activity.
 
Series 5 battery sucks big time.
Depends. Did you have it set as a workout where the watch continuously checked your heart rate? Was it an outdoor workout where GPS was active? Was it on cellular during that time? All the above?

Today I used 12% on a 40 minute outdoor run — no phone with me, LTE on, outdoor run workout with HR and GPS, series 5 AOD, plus listening to music on my Bluetooth AirPods (music was stored on watch, FWIW, not streaming). Fully expected a big power hit.

But... reportedly watchOS 6.1 is much better for battery life. I hope so. We‘ll see.
 
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