Settings -> About phone -> Battery use This gives you an excellent display of what hardware and software components have used the most of your battery power.

Settings -> About phone -> Battery use This gives you an excellent display of what hardware and software components have used the most of your battery power. Take a look at the applications using the most battery, and you can either find apps that have inefficient background processes, or apps that are set to update their data too frequently. Edit: My current list: Display 41%, Cell Standby 28%, Phone idle 25%, Wi-Fi 8%; Everything else: peanuts.