HP OmniBook - Manual (Page 31)

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Maintaining the backup battery. The permanent, internal backup battery recharges
whenever you plug the ac adapter into the OmniBook. The backup battery can run
down if you always charge the main battery in an external charger and never
connect the ac adapter to the OmniBook.
To install a second battery
To increase the time you can work on battery power, you can install a second, high-
capacity battery in the floppy or CD-ROM drive bay.
1. Important
Save your work. Then press the blue On/Suspend button to stop the OmniBook.
2. If necessary, remove the floppy drive or CD-ROM drive from the OmniBook.
3. Slide the high-capacity battery into the OmniBook until it clicks into place.
A second Battery indicator appears in the Status Panel, showing the charge level
of the new battery.