One reason could be that the apps are running all the time. What you should do is on the home screen, hold down the blackberry button and it will show all of your apps that are still open. And close the ones your not using. But there are 5 that have to be open all the time which are:
Phone, Messages, Browser, Blackberry Messenger and Home Screen
When apps run all day, they drain the battery. You can also set your home screen to 4 icons and not 8 which is default. I've heard that works, but not sure if its completely true.
03-06-09 01:35 AM