Well this is what should be happening because your 6/6S battery is significantly lower thanGetting decent battery life on my 7: been getting about ~9 hours usage time compared to only about ~7 hrs on my 6/6S.
if you used the webs instead of the Facebook app I bet you'd get at least 10% better battery. That app is know to be a battery hog (along with snap chat)![]()
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Got it yesterday on the day of launch here in India. Battery life seems decent to me as of now. Still early days though. Real test will be to see how it goes on Monday which will be a working day.