How to improve the battery life of my Iphone 5?

Its dies very quickly. I charge it to 100% not even an hour later its down to mid 70s. I do not leave it charging at night. I don't know what to do, but its getting annoying. Please help. Will give 5 start to most helpful answer.

If you're runing iOS 6.1, that's the problem. Also, if you spend a lot of time connecting to your data network and constantly have the screen on playing games or using resource heavy applications, then that also drains battery.

Turn brightness down