Apple PowerBook G4 (17-inch, 1.67 GHz) - Manual (Page 52)

52 Chapter 3 Using Your Computer
If your battery runs low while you are working, you can put your PowerBook to sleep
and replace the battery with a charged one. The internal backup battery provides
enough power to maintain the contents of RAM for up to 3 minutes while you change
the battery.
Note: If you have installed additional memory in your PowerBook, the backup battery
may provide power for less than three minutes. Also, changing batteries several times
in a short period can shorten the length of time the backup battery can maintain data
if the backup battery hasn’t had time to fully recharge.
Important: If only one flashing light is on, very little charge is left. If no lights are
visible, the battery is completely drained and the computer will not start up unless the
power adapter is connected. Plug in the power adapter to let the battery recharge, or
replace the drained battery with a fully charged battery (see page 53).
If the battery icon in the Finder menu bar is set to show the percentage of charge, you
may sometimes notice that the battery does not maintain a full charge of 100 percent
when the power adapter is attached. When the battery level eventually drops below 95
percent, it will charge all the way to 100 percent. This saves battery life as charging is
not continuously cycled on and off.
Battery Battery LEDs
LL3140.book Page 52 Thursday, February 17, 2005 4:27 PM