Then you've got an issue. I came from the Bionic with extended battery, and the S4 lasts much longer. You probably have an app or service sucking down your battery. First, do a battery pull for at least 1 minute. Next, I'd suggest installing Gsam Battery Monitor (Pro), System Panel Lite, and OS Monitor. Those three apps will give you the tools necessary to track down battery drain and plenty of other issues. On mine, I note that after I use Chrome, it keeps running and using CPU power. Every time I'm done with Chrome I use System Panel Lite to force stop it. You'll want to make sure that things like Google sync or Email apps are not syncing too frequently, and you'll want to make sure the screen is not running at full brightness. I have an app called Wi-fi Matic that only turns on Wifi when you are within range of cell sites surrounding places you want Wifi, such as work and home. It learns which Wifi's you want it to automatically connect to. Otherwise it is off.