my blackberry pearl actually has GREAT battery life.

I can: text all day, get emails from my blackberry email account, my aol account, go on aim for a little bit, browse the net for some lyrics or news, listen to a few mp3's, make a few calls, and have the battery last me ALMOST 72 hours!!

but this is what I do for that: i use the BB Dimension ZEN theme, screen brightness set to 10% [I can still see great!], have the screen time out after 10 seconds, and at night i kill the radio [the reception]. plus i keep it holstered when its not in use.