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I don't know if this is a known feature, but I upgraded to an iPhone 6s and restored my Apple Watch. The battery life is the best its been in a long time. by the end of the day we are looking at 30-40% remaining and Apps are much more reliable now. I have had my 6s for like 3 weeks now.

Did they improve the bluetooth stack for the iPhone 6s or something? I would say it was the restore, but when paired with my iPhone 6 it was still pretty bad even after a restore.
This gives me some hope for the future, as I think the stack on my 6 is terrible.
 
I have noticed terrible battery drain as of late. I put on my watch at 6:20 am, its currently 8:00 am and I have done nothing on my watch except receive 2 texts. Its down to 79 percent already.

I have hard reset watch and phone recently (yesterday i think)

:(
 
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