what kind of life to you get out of your battery? I have a Compaq Presario V2000 and at a full charge I only get about an hour and a half of life. I use it almost exclusivly for school work. I take it to class to take notes on and use the internet. If I use the cd/dvd player I loose charge quick. In my hour long classes it's fine. But if they're in a row like today, I have to make sure I sit by an outlet to be able ot charge for the next class. However I have a couple 3-4 hour classes and there's no useable outlet to plug into. Can anyone recommend an aftermarket battery that would last.