Running out of juice too early? Here are some great ways to manage your battery between charges. I do all of these, but my greatest advice is to TURN OFF features you're not using--like Bluetooth, WiFi, Notifications (like Push notifications), auto mail fetching (do it manually), Location Services, and 3G. Unfortunately, some of these are spread out and need a little tapping to turn them all off. If you just need it to be a phone and iPod, turning off the previously mentioned services will greatly expand your battery mileage.
If you only need the features of an iPod or PDA, Apple makes it easy: Just flip the Airplane Mode switch under Settings.
Every iPhone user knows that the battery life isn't fantastic. Well, us heavy users anyways. If all you do is type out 10-15 texts a day or maybe make a phone call the iPhone will last easily. For those of us using WiFi, and browsing the web, and constantly reading our feeds, checking emails, testing out applications, and who knows what all day, the battery life can be a little bit on the lacking end. Here are a few of my personal tips to help you get a little bit extra out of your battery.[From iPhone Battery, How To Help Make It Last | iGadget Junkie | iPhone App Reviews & Giveaways ]