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and have you checked under battery in settings to tell you what application is using the battery? You may find there is one application doing most of the damage.
That was my reason for asking for a screenshot of the battery screen (see post #4).
 
Are you sure it relates to the OS update? I am on a 6 Plus at the moment and the battery life is pretty much the same as before.
yeap pretty sure caz before update I would still get 50-60 percent and won't need to charge it soon as i get home. Now i would get home at 12-15% and in need of charging
 
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