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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
(NiMH) battery. The battery provides power for about 2–7 hours of work
time (depending on the PowerBook model and type of battery you have
and the battery conservation features you choose).
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AC power
You can run your computer from a grounded 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.
Responding to low-power messages
When the batteries run low, the computer displays a series of low-power
messages. The work time remaining after you see the first message varies
depending on how you are using the computer. It’s a good idea to act
promptly.
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5
Power Management
Read this chapter for information
about your PowerBook’s battery.