Apple Thoughts: Tips to Improve Your iPhone Battery Life

"The iPhone battery is designed to provide a significant amount of talk time, internet/app use, and data consumption. By using the phone properly and customizing a few settings you can dramatically improve how long your iPhone battery lasts."

For me, I found that running the battery out until the iPhone 4 died, and then recharging fully before using it seemed to slap the battery enough to fix the problems I was having. However, there are some other good tips in this article to improve battery life that I think anyone would find useful.