Disable push notifications you don't care about
Do you really need an alert every time you get a "Hot Singles in Your Area With Free iPads and Viagra!" email? Go to Settings > Notification Center to keep tabs on all those pesky pushers. If you MUST immediately know about every new Tinder match, you can augment your push notifications, leaving out vibrations, activation of the backlit display, and other battery killers. Which leads us to...
Let's face it, vibrations feel so great. But they are a capitol source of battery suckage. Aside from shutting the vibes off completely, you can actually make custom, shorter vibrations, or make sure your phone only vibrates if certain people call/text. Go to Settings > Sounds, and from there you can access your vibration settings. To customize your vibration, you need to select a specific "Sound and Vibration" option (ex: ringtone, text tone, etc.).
Don't let apps track your location
Many apps utilize your phone's GPS system, and you might not even know it. Like our government, Facebook, Yelp, Instagram, Snapchat, and even your camera have location-based features that may be running in the background and draining your juice. Go to Settings > Privacy > Location Services to see which apps are tracking you. You can simply shut off all of them, or manually pick and choose the apps that need this feature.