HP nx9000 Reference Guide - Page 43
To get the most from your batteries
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Batteries and Power Management Using Battery Power To get the most from your batteries Follow these suggestions to make your battery power last as long as possible: • Plug in the AC adapter, especially when using a CD-ROM or DVD drive, or any external connections such as a PC Card or a modem. • Set the display brightness to the lowest comfortable level (Fn+F1). • Put the notebook in Standby whenever you are not using it for a short while. • Put the notebook in Hibernation whenever you want to save your current session, but will not be using the notebook for a day or more. • Set the automatic timeout settings to emphasize saving power. If your notebook has a multispeed processor, use the lower speed on battery power (the default settings conserve battery power). • If your notebook has a wireless on-off button, turn off the wireless function when you are not using it. Press the wireless on-off button so that the light turns off. • If you have a PC Card such as a network card, remove it 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 PC Card, exit the application when you finish using it. • 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 notebook 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 percent to 50 percent to minimize capacity loss by self-discharge and to avoid deterioration of battery performance. • Avoid using or charging batteries at high temperatures. 34 Reference Guide