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6
Power Management
Power sources
Your computer can draw its operating power from two different sources:
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Main battery
Your computer’s main power source is a nickel-metal-hydride
battery. The battery provides power for about 2–4 hours of work time
(depending on the battery conservation features you choose).
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AC power
You can run your computer from any standard electrical outlet by
plugging in the power adapter.
Your computer also has a backup battery that maintains the contents of RAM
while you replace the main battery. The backup battery does not provide
enough power to run the computer.
These power sources are described in more detail in the following sections.
Monitoring the battery charge level
There are two ways you can monitor the charge level of your battery:
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Use the Battery Monitor module in the Control Strip.
See Chapter 5 for
instructions.
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Use the Battery desk accessory.
See the next section for instructions.
Read this chapter to learn
how you can maximize your
PowerBook’s battery life.