Apple PowerBook (Duo, 2300 Series) - Manual (Page 75)

Recharging the battery
There are three ways to recharge a battery:
m Plug in the power adapter to recharge the battery without removing it from
the computer.
m Remove the battery and recharge it in the (optional) recharger.
m Put the Macintosh PowerBook in the Duo Dock Plus, where recharging
begins immediately.
Recharge a battery shortly before you plan to use it. The battery does not
retain its charge in long-term storage.
Recharging in the computer
Plug in the power adapter as shown.
WARNING Use only the 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.
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