Welcome to the forums. There are, indeed, many threads in the troubleshooting section about battery life. As a start, install spare parts from the market, plug your phone in for a minute then unplug it, leave your phone asleep for a few hours, then open spare parts. Select battery history, then select partial wake usage for the top dropdown, and verify that the second drop down says since last unplugged. That will give you a list of apps that held a wake lock (held the phone awake), and show how long they did so. What do you see there?