A few ways to conserve the batt and lengthen the time of the batt:
1) Dim the lights as much as you can, make sure you can see without straining
2) Turn off your sound
3) Close as many programs as possible
4) Go to www.blackviper.com
and look under your OS title, close as many applications as possible, it really uses up the batt too.
5) Set your power settings
6) Utilise screen saver as much as possible