HP OmniBook XE4400 User Manual page 57

Put the computer in Hibernate mode whenever you want to save your current session,
but will not be using the computer for a day or more: press Fn+F12.
Set the automatic timeout settings to emphasize saving power—see "How the
computer manages power automatically" on page 52.
If your computer has a wireless on-off button, turn off the wireless function when
you're not using it. Press the wireless on-off button so the light turns off.
Check that the display is using the Powerplay option. In Control Panel Display, on the
Settings tab click Advanced, and then on the Powerplay tab check whether Powerplay
is enabled. This allows the computer to save power when it's not needed by the
display.
If you have an I/O PC Card—that is, a PC Card having an external connection, such
as a network card—remove it when you're not using it. Some I/O cards use
significant power even while they're inactive.
If you work with an application that uses an I/O PC Card, exit the application when
you finish using it.
In addition, follow these suggestions to extend the life of your batteries.
Do not leave batteries unused for long periods. If you have more than one, rotate
them.
If you normally use AC power, make a practice of using the battery as your power
source at least once a week.
Unplug the AC adapter when the computer is not in use.
To preserve the life of a battery, be sure to charge it regularly.
For long-term storage, the battery must be charged 20–50% to minimize capacity loss
by self-discharge and to avoid deterioration of battery performance.
To maintain maximum battery capacity and accuracy of the battery gauge, perform
this calibration procedure every few months:
1. Click Start, All Programs (or Programs), Hewlett-Packard, Notebook, HP Battery
Optimizer.
2. Follow the displayed instructions to test and condition your battery. The process
could take 4–6 hours or more per battery. You can use the computer during the
process. If you interrupt the process, the battery might be left with a low charge.
Batteries and Power Management
Using Battery Power
Corporate Evaluator's Guide 57