There are ways to conserve iPhone battery life, but many of them involve turning off services and features, which makes it a choice between all the cool things that the iPhone can do and having enough juice to do them. But some of them are so useless in your day to day, that you wont even miss them.
 
Turn on Auto-Brightness and Reduce Screen Brightness. If it isnt being used, Turn Bluetooth Off. You can even turn off 3g/4g if you are in a place with wifi. Turn off location service on your apps, who really needs that anyway. Set your autolock to go in effect sooner. Finally, double click your home button and delete all of your app history that comes up on the bottom. I guarantee your battery will last you twice as long if you do all these things. We’ve all been there, an iphone is no fun with no juice in the battery!