HP Compaq NX9020 Startup Manual page 32

Battery Packs and Power Management
If your notebook has a wireless on-off button, turn off
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the wireless function when you are not using it. Press the
wireless on-off button to turn off the light.
If you have a PC Card, such as a network card, remove it
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when you are not using it. Some PC Cards use significant
power even while they are inactive.
If you work with an application that uses the serial port or a
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PC Card, exit the application when you finish using it.
In addition, follow these suggestions to extend the life of your
battery packs:
Do not leave battery packs unused for long periods. If you
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have more than one, rotate them.
Unplug the AC adapter when the notebook is not in use.
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If the notebook will be unused and unplugged for more than
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2 weeks, remove and store the battery pack.
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CAUTION: To prevent damage to the battery pack, do not expose it to
high temperatures for extended periods of time.
High temperatures accelerate the self-discharge rate of a
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stored battery pack. To prolong the charge of a stored battery
pack, place it in a cool, dry location.
To maintain the accuracy of battery charge displays, calibrate
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a battery pack that has been stored for one month or more
before using it.
Avoid using or charging battery packs at high temperatures.
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3–4 Startup Guide