Apple PowerBook (2400c) - Manual (Page 71)

71
Power sources
Your computer can draw its operating power from three different sources:
m Main battery Your computer came with a lithium ion (LiIon) battery. This
battery should provide power for 2–4 hours of work time (you may get
longer work time, depending on the Macintosh PowerBook model you have
and the battery conservation features you use).
m AC power You can run your computer from a grounded electrical outlet by
plugging in the external power adapter that came with your computer.
The installed battery will automatically be charged whenever the external
AC adapter is connected. The external adapter will charge the battery
more quickly if the computer is shut down or in sleep.
IMPORTANT Be sure to use only the type of external power adapter that
came with your computer. Other power adapters (including ones made for
other Macintosh PowerBook computers) may damage your computer.
m Backup cell The PowerBook also contains a rechargeable LiIon backup cell
to keep system information such as date and time. The backup cell is
automatically recharged whenever the external AC adapter is connected.
The backup cell also provides up to 4 minutes of power during system
sleep while you change the main battery. (See “Removing or Replacing
the Battery” later in this chapter for more information about changing
batteries.)
5
Power Management
Read this chapter for
information about your
Macintosh PowerBook’s battery.