Apple PowerBook (2400c) - Manual (Page 74)

Recharging the battery
To recharge the battery, plug in the power adapter. (Do not use an external
recharger designed for another Macintosh PowerBook model.)
A lightning bolt icon appears in the battery monitor portion of the Control
Strip when the power adapter is plugged in and a battery is recharging.
The battery is recharged even if you are using the computer; however, it will
recharge more quickly if the computer is off or in sleep.
WARNING Use only the external power adapter that came with your
computer. Adapters for other electronic devices (including other
portable computers) may look similar, but they may damage
your computer.
Power adapter plug
¯ Power adapter port
Power adapter
Power cord
Your power
adapter may look
slightly different.
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