King of Hearts,
Thanks so much for the clarification. I'm afraid my explanation wasn't really clear before
Dell is claiming that one battery (66Whr) is going to last between 2 and 3 hours. But I guess you're right it probably won't last as long if the screen is really brighter.
I'm thinking about changing the screen resolution but I'm not sure if this would work well. Right now I have a laptop with 1024x768. If I change the resolution to 800x600 it looks pretty fuzzy.
Thanks again, it's always good to get a second opinion!
axelhi