A new type of battery, called a smart battery, provides the computer with information about its power status so that the computer can conserve power intelligently. With a normal battery, the computer makes estimates about the battery's condition that are not always correct.

Battery Technology Inc.
Home page for Battery Technology Inc., one of the leading manufacturers of computer batteries. The page contains their catalog, FAQs, international vendor list, and product information.

Yahoo!'s batteries page
Yahoo!'s directory of links to battery manufacturers and service providers.