Apple PowerBook (200 Series) - Manual (Page 58)

Recharging in both the computer and a recharger
You can use a single power adapter to run the PowerBook and the battery
recharger at the same time.
If the PowerBook is on and contains a battery that is not fully charged, the
computer charges the internal battery first. The external battery does not
begin charging until the internal battery is fully charged. It takes a little over
2 hours for a fully depleted battery to charge.
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:
50 Chapter 5