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So, I've been on the dev beta, and beta 6 for me, is stable. But the battery life is horrid, which wasn't the case on beta 5, again, for me.

I went to bed last night at 100%, woke up with it at 79%, I've used it for a 30 min workout and at 7:15pm CST it's at 40%

Not that huge of a deal, but I noticed it.
 
Yup

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I installed PB3 on my series 3 Watch.
I mentioned, that now I have issues with Walk activity. For longer walks about 5 km, I miss first 1 - 2 km on map. I can see walked km normaly, but only miss that part on map.
It's weird and when I sync it to Strava I have cut out this part and on Strava and activity is then shorter.
 
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