To do this, Apple engineers custom-designed lithium-polymer cells to create the largest possible battery, then they went even further: They built the battery right into the computer, eliminating the space-consuming mechanisms and housings that standard removable batteries require. The result is a battery that’s 40 percent bigger than the previous generation and offers up to 8 hours of wireless productivity on a single charge.

Hurray! First the iPod, then the iPhone... now in laptops too! Now, when your battery wears out, you can just get a new computer.

(Yes, I actually do own more than one battery (only $5!) for my blackberry, and replace batteries for laptops to give them new life).

Apple - MacBook Pro - 17-inch Features - 8-hour battery, high-resolution LED-backlit display, aluminum unibody, NVIDIA graphics