RDR wrote:I thought that too but one of my more powerful laptops actually has a battery life longer than some of my less pwerful ones.
Newer chips are more power efficient as well, and tend to throttle themselves back to use less power when they're not in use, whereas older chips couldn't step down so would go at full speed all the time.
A large part of the power usage of any mobile device is the backlight for the screen. They tend to use much more efficient LEDs these days, rather than CCFLs.
As mentioned, battery technology's come a long way, and older batteries get "worn out" so won't hold as much of a charge, and will discharge quicker than they used to.