Apple PowerBook (2400c) - Manual (Page 72)

Monitoring the battery charge
There are three ways you can determine the charge level of your battery:
m Look in the battery monitor portion of the Control Strip.
For information on the battery monitor, see the “Batteries & Power” topic
area of Mac OS Guide, available in the Guide (h) menu.
m See low-power messages on your display.
m Look at the battery level icon next to the clock in the menu bar.
Responding to low-power messages
When the battery runs low, the computer displays two low-power messages.
The work time remaining after you see the first message varies depending on
how you are using the computer. It’s a good idea to act promptly.
What you should do
When you see a low-power message, you should do the following:
m Plug in the power adapter, or
m Save your work and shut down the computer, then
m Quickly replace the empty battery with a charged one (within 30 seconds, if possible).
IMPORTANT Always save your work when you see a low-power message.
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