This app is only for supporting my work with the battery warner. It has no extra Features! You can find the free version right here: https://play.google.com/store/apps/details?id=com.laudien.p1xelfehler.batterywarner This library helped me with the intro: https://android-arsenal.com/details/1/4368 Here you can find the library for the graph (GraphView): http://www.android-graphview.org/ You can find the sources right here: https://github.com/P1xelfehler/BatteryWarner</br></br></br></br></br></br>