Apple Macintosh PowerBook 150 - Manual (Page 78)

Recharging the battery
There are two ways to recharge a battery:
m Plug in the power adapter to recharge the battery without removing the
battery from the computer.
m Remove the battery and recharge it in the (optional) recharger.
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
(or a power adapter designed for use with other 100 series
PowerBooks). Adapters for other electronic devices (including other
portable computers) may look similar, but they may damage your
computer.
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Power adapter port
69 Power Management