is your "books" battery running low quicker than when you bought it? here are some quick tips to help prolong the charge of your powerbook or ibook battery. from the apple knowledge base:
"Optimize your battery settings in Energy Saver preferences.
1-From the Apple menu, choose System Preferences.
2-From the View menu, choose Energy Saver.
3-Click Show Details.
4-Choose Battery Power from the "Settings for" pop-up menu.
5-Choose Longest Battery Life from the Optimize Energy Settings pop-up menu.
These settings will put the hard disk to sleep whenever possible and reduce the computer's microprocessor performance in order to maximize its battery life. If you are using processor-intensive applications, you may wish to change these settings so the microprocessor performance is no longer reduced.
Turn off unused features and technologies.
Just as you would turn off the lights in an unoccupied room, turning off unused features and technologies can help maximize your battery life, too. Here are a few suggestions:
1-Eject CDs and DVDs you're no longer using. Every so often, the optical drive spins up to read CDs or DVDs. This consumes a small amount of power.
2- * Disconnect peripherals when you're not using them. Connected peripherals, such as printers and digital cameras, can draw power from your battery even when you're not using them."
these are just a few of the tips that can help you get more out of your laptop.