Apple PowerBook (Duo 270C) - Manual (Page 115)

Maximizing work time
Your PowerBook’s battery can provide from 2 to 6 hours of work
time before you need to recharge it. The actual work time
available depends on what equipment you’re using with your
computer and what steps you take to conserve power while you
work.
Ways to conserve battery power
The more of these steps you take, the longer you can use your
battery before recharging it.
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Turn down the screen brightness whenever possible. At its
brightest level, the screen consumes about a third of the
power your computer is using.
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Keep screen dimming turned on in the PowerBook control
panel. This feature dims your screen automatically if you
haven’t used the computer for a few minutes.
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Adjust the battery conservation settings in the PowerBook
control panel for maximum conservation.
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Keep processor cycling turned on in the PowerBook control
panel; set the computer’s microprocessor to run at a reduced
speed; and keep the automatic power conservation settings
turned on. The rest of this section describes these settings in
detail.
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Keep virtual memory turned off in the Memory control panel.
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If your computer has 6 MB of memory or more, use a RAM
disk as your startup disk to minimize hard disk use.
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Quit any program that uses a modem unless you’re using the
program for telecommunication. As long as the program is
open, your modem is consuming power.
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If you’re working near an electrical outlet, plug in the power
adapter.
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If you aren’t using the computer, put it to sleep and plug in
the power adapter.
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If you have a PowerBook Duo 270c, use the Battery
Reconditioning application every 30 days.
Chapter 6: Power Management 99 Chapter 6: Power Management 99