Very bad battery life?

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2017-01-20 01:13

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Now I'm currently on 5.1.3.0 and my battery cant even hit 4 hour screen-on time. (It was even worse in 5.1.12)
But a few months ago my battery life was normal, and i'm sure that I dont have any viruses, and the health of my battery is good.  What can I do? What can cause this? Do you guys have any problems with the battery?