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How long ago have you updated? I suggest you wait some more,restart the device regularly.
Follow the suggestions on this post
http://talk.sonymobile.com/t5/Xperia-Z3-Compact/Problems-with-battery-charging/m-p/957435
So you are using wifi or mobile data and which one causes trouble?
That could be, I usually notice that after a major update, the battery will drain faster if I'm on WiFi, usually play store or G+ are syncing uploading and downloading stuff.