Over the last few months, it has become apparent that there is a big problem with Samsung Galaxy S4 battery keeping their charge. I first noticed this myself when I was using an app on my phone to keep track of my cycle rides over the weekend. The S4 battery lost charge after only a few hours of use, and over time, its performance became worse and worse. Initially, I put this down to the phone perhaps running too many apps, or the GPS draining the battery, but as time went on, the battery drain issue in my S4 became worse and worse.
Problem with Samsung Galaxy S4 Battery : You are Not Alone!