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Get my Series 5 battery to last longer than 9 hours and then we'll have a conversation about such things.
I suspect an app may be causing the issue. I use an S3 LTE with default apps and I get approx. 2 days battery life. That's with wearing my watch while sleeping.
 
The sleep app a real challenge to get right. One significant reason for many. More then one person in the bedroom and even more important same bed. The watch senses movement, and noise, plus vitals. All impacted by another person. The other person moves, gets up, all the above can easily respond. Sense the movement and the heart rate will move a few points. Thus, giving a false reading of sleep at that point. Go from deep to normal maybe.

Been using a Watch app for sleep for two years. Works well but the daily results not always aligned by how I felt from the nights sleep. Upon analysis, the other person has a greater impact on the results then my original thoughts.

To get it right, two bedrooms.😂
 
I suspect an app may be causing the issue. I use an S3 LTE with default apps and I get approx. 2 days battery life. That's with wearing my watch while sleeping.
But thats series 3 not series 5...might have something to do with series 5 or maybe just 6.1 who knows.

mine is on 21% left after off charger at 7.30am And it’s 20:50 now.
 
I found out about this yesterday. It's the only sleep tracker that uses coreML, looks like something Apple would make and is about 4mb in size. Although, it's the most accurate one I have used. Apple should just copy this.

 
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