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I had this problem with an iphone 6 for over a year now. It was so bad I had to carry around a battery pack. All tested suggested the battery was OK.
It has been fixed in the recent ios10 beta (I even got a note from apple confirming the fix in the beta program). Since then no problems and the phone runs late into the evening without the need for a recharge. it's like a new phone.
So 10.2.1 should fix the problem for most people.