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Beta 1 killed my battery but Beta 2 is a mixed bag. Some days it's at 50% near the end of the day and other days I have to recharge at dinner. Can't figure out why, but usually it's much better than watchOS 1 was.
 
You are aware that beta code may well include symbol information and additional debug code? There could be whole swathes of code that don't make it into the release image, those extra cycles and the extra memory footprint could really change battery life so don't start criticising IOS 9 or Watch 2 until the release code comes out and we know for sure.

These betas are there to give developers access to new features so that there are cutting edge apps available making full use of the new platform, also to get some stability feedback along the way for the new features. Things like performance and battery life can't be known until the release versions are available.
 
So... according to the Watch App on iOS 9 Beta 2, it's saying that my usage time and my standby times are exactly the same

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On the other hand, the batteries app is telling me these are the current battery levels, even though my watch is telling me it's at 80%
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I've restored as new, same issue.
Restored from an earlier backup, same issue.

Someone recommended turning off "Hey Siri" in the Watch Settings, so I'll report back on my findings.
 
Battery life has been pretty terrible for me, it's 9 am and the battery is at 64%. I started my day at 7.

The bad battery does not bother me TOO much, but I get annoyed when the watch freezes up and needs to be restarted.
 
I just read this posting in the official Apple Developer Forums and it seems to work. I am just trying it out and I "think" the battery draining is quite better than before.

https://forums.developer.apple.com/thread/8294

Thread from Jul 4, 2015 12:26 PM:

Hey, guys!



I've found a few workarounds for the WatchOS2 to work almost as 1.0.1 (keep in mind that this steps might not work for everybody, who knows):



- To fix taptics which don't work, re-pair your watch and DON'T change the Haptic Feedback configuration. Don't touch that slider;

- On the iPhone, tap on "Reset Sync Data". This will fix corrupted contacts;

- On the iPhone, select a default city instead of current location for the Weather complication to work;

- My battery was very, very bad, and nothing could fix it. The last thing I did (after 4 restores) was to sign out from FaceTime and iMessage on my iPhone (not just turning them off, but signing out of the Apple ID on FaceTime and then turning it off and also iMessage. Once you turn them on again, link them once again with your Apple ID. That could possibly the reason why my battery life improved around 275%.
 
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