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If the PowerBook is in sleep or is shut down, internal and external batteries
charge simultaneously. If both batteries are fully depleted, it takes about 4
1
⁄2
hours to charge both. If the internal battery is fully charged or absent, the
external battery takes a little over 2 hours to charge.
Removing or replacing the battery
m If the power adapter is plugged in, you can use the computer indefinitely
without a battery.
m If the power adapter is not plugged in, the backup batteries in your computer
protect open programs and documents for about 4 minutes, allowing you
to remove the depleted battery and replace it with a charged one. (The
backup batteries maintain other kinds of information, including control
panel settings such as the clock time, for up to two weeks after the main
battery is discharged or removed.)
To remove or replace the main battery, follow these steps:
1Save your work, and then choose Sleep from the Special menu.
You can choose Shut Down instead of Sleep if you feel more comfortable
working without the 4-minute time limit.
2Close the display.
3 Open the battery door by pressing the small button and sliding the door in the direction
indicated by the arrow.
The door is physically attached to the battery.
4 Carefully pull the battery out of its compartment.
65
Power Management