My dual SLI GPU laptop can barely get 2 hours. About the only way to extend it is with external battery packs. But that adds pounds to the rig.
My fix was to get a normal laptop for when I will be presenting our apps where I must be without power for a few hours.
I got a new Asus GL552J and everything had been good so far with a slight issue: the battery can't go on for long. I know a gaming laptop eats a lot of power but only 2 hours in power saving mode is just not enough. So anybody know how can I get a better battery for this, if there are any way at all?
Thanks a lot.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic