As was mentioned, I'd check that wi-fi is off and bluetooth is off under manage connections( unless you are using them of course )
![Smiley](http://www.blackberryforums.com/images/smilies/icon_smile.gif)
I've also found it helpful to turn the backlight brightness down a bit and set the backlightimeout to 30 seconds ( or less) This is under options/screen and keyboard.