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I have the same problem that recently started with way too much usage; but mine is mainly at night. I do sleep tracking, which is on my iPhone, but not on the watch. I have tried many of the suggested solutions on a different longer thread on this subject. I am going to delete the sleep apps off of my iPhone and see if that makes a difference. I don't know why it would, but has to be the only thing that would be active mainly while sleeping.
 
So then, I re-paired it and restored from backup and it was the same - usage and standby within 10 mins of each other.

I re-paired this morning and set up as new, and first 7 hours it was the same usage and standby, so I thought here we go again. But now it is showing 15 hours standby and 8 hours use, so it seems to have settled down. I'm on 20% which is poor for me, but i'll do a full charge overnight to see how we are tomorrow.

FWIW, I have not installed ANY apps except the stock ones on the 'set up as new' and have noise off.
 
Strangely today for some reason, I’ve changed nothing, put on my watch at 7:30am, and currently 9:30pm, it’s still on 38%.

I haven’t done a walking workout but had normal other usage I’d stay. No idea what’s going on.... this is the battery usage I’d say I was getting before it plummeted.
 
Still having horrendous battery life. Example. Put on watch at 9:30am at 100%, by 12:30pm was down to 23% with a few tWhatsApp notifications only.

So last night decided to unpair/reset the watch, and rather than setup from backup, did as new one. I didn’t add any apps yet just stock.

Put watch on at 9:30am 100%, now at 7:30pm with just texts/WhatsApp notifications today, it’s at 75%. This is a massive instant improvement.

So it’s either needed a reset, something was corrupt on it, some app is causing high battery use?

I’m glad it’s worked today, as sort of proved it’s not my actual watch battery.

Suppose have to start adding apps now and see what happens. I only had very few anyway on there, maybe less than 5, so surprising how bad it became.
 
Bit of update. I reset both my watches, this time didn’t restore just setup as new.

Both watch batteries are now back to what they were, as in last a day.

Not sure what was wrong but glad I did it as was about to chuck in the towel!

I will add apps back eventually, but realised there’s actually not a lot I must have used apart from stock anyway.
 
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