Apple PowerBook (Duo, 2300 Series) - Manual (Page 79)

Removing or replacing the battery
When you remove a depleted battery without first plugging in the power
adapter, the backup battery in your computer protects open programs and
documents for about 4 minutes, allowing you to remove the depleted battery
and replace it with a charged one. (The backup battery maintains 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.)
If the power adapter is plugged in, you can use the computer indefinitely
without a battery.
To remove or replace the main battery, follow these steps:
1 Save your work, and then put the computer to sleep.
You can shut down if you feel more comfortable working without the
4-minute time limit.
2 Close the display.
3 Open the battery door by pressing the small battery release 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.
Put the battery in its plastic case if you won’t be recharging it.
5 If you are inserting another battery, slide it into the battery compartment.
Replacement batteries come with a door attached.
Battery release button
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