Apple PowerBook (Duo 270C) - Manual (Page 103)

Power Management
In this chapter
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Checking the battery level
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Responding to low-power messages
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Recharging the battery
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Removing or replacing the battery
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Maximizing battery life
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Getting the most work time out of the battery
Power sources
Your computer can draw its operating power from two different
sources. You choose which power source to use.
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Main battery: Your computer’s main power source is a
nickel-metal-hydride battery. The battery provides power for
up to 6 hours of work (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 backup batteries that maintain the
contents of RAM while you replace the main battery. The backup
batteries do not provide enough power to run the computer.
These power sources are described in more detail in the following
sections.
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Chapter 6