go into the settings and then applications and background taskss. Block background operations for all of the apps you do not need to have running in the background to see if that helps. If it is getting warm, an application can be running in the background. Also, after you run an application, if you do not need it anymore, use the back arrow to go back to the start screen to completely exit it. If you just press the home key, it can stay running and drain your battery (and keep the phone warm). If it ever gets hot when nothing is running, something could be tying up the processor. Do a soft reset to clean it up (hold power and volume down until it vibrates and resets). I got poor battery usage at first, and now I easily get a whole day doing these things.