When I got my note 3 it had excellent battery life. I was only charging it every other day. After a few weeks it got where it was barely lasting a whole day. I'd often put it on the charger in with less than 5% left. Besides the screen my biggest drains were android os and android system. I took out my sd card and left it out and shut the phone down and did a battery pull. It is back to having excellent battery life. I don't plan to put the sd card back in, but I wonder if formatting the sd card would have helped. I hope this helps someone else.