I’ve seen various claims from laptop manufacturers regarding battery life. 4, 6, 8 hours. Most sound exaggeratedly unreal since among the dozen or so PC and Mac laptops I’ve owned, I’ve never seen more than about 2 – 3 hours of battery life. I’ve been known to fly across the Pacific with a bag full of laptop batteries so that I could work or watch movies for 14 hours.
Below is a pie chart developed by Microsoft engineers that shows which components of a laptop drain the battery.
Very simply, the culprit is the LCD monitor.
Solution: The best way to extend your laptop’s battery life is turn down the backlighting on the LCD as much as possible.