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Try installing Snap Dragon Battery Guru. It takes a few days to learn about your use patterns before it does anything but then it does a pretty good job of optimization. My battery was only down 20% at the end of the day yesterday which was significantly better than I was seeing before Battery Guru started to do it's thing.
Im using inkpad and also downloaded applocker which is nice to lock up the notes. I used to have to take a screen shot of the notes then move them to a vault. Now I can just make the note and its locked. Inkpad seems closer to the iphones note app to me btw.
As far as battery life mine shows my screen display is using most of my battery . I have been using my phone quite a bit since its new and im new to android but it does seem to not last long and takes forever to charge. If it warns you your at 14 % you better get a charge on it. It will go quick after that.