Apple PowerBook (Duo, 2300 Series) - Manual (Page 81)

Replacing the backup battery
In addition to its main battery, your computer has a small backup battery that
maintains the contents of RAM while you replace the main battery.
The backup battery usually lasts for several years. You may need to have it
replaced if you notice that some of your system settings changed after you
removed or replaced the main battery. (You may notice, for example, that the
clock time is different.) By replacing the backup battery, you can preserve the
contents of RAM the next time you change the main battery.
Your computer’s backup battery must be replaced by an Apple-authorized
service provider.
Reconditioning the battery
To maximize battery life, you should recondition the battery once every
30 days, using the Battery Reconditioning program. You can find this program
in the Utilities folder on your hard disk, and also on the system software
floppy disk labeled Disk Tools. Keep the Battery Reconditioning program on
your hard disk so it is convenient to use every 30 days.
IMPORTANT It takes 2 hours to run the Battery Reconditioning program and
another 2 hours to fully charge your battery in your Macintosh PowerBook.
During the time you are reconditioning your battery (and recharging it, if you
don’t have a recharger), you cannot use your PowerBook. Plan to recondition
your battery when you won’t need your PowerBook for at least 4 hours.
To recondition a battery, follow these steps:
1 Make sure your PowerBook is connected to a power source.
2 Turn on your PowerBook.
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