Power Management User Guide
© Copyright 2008 Hewlett-Packard Development Company, L.P. Windows is a U.S. registered trademark of Microsoft Corporation. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.
Product notice This user guide describes features that are common to most models. Some features may not be available on your computer.
iv Product notice
Table of contents 1 Setting power options Using power-saving states ................................................................................................................... 1 Initiating and exiting Sleep ................................................................................................... 1 Initiating and exiting Hibernation .......................................................................................... 2 Using the battery meter ..........................................
4 Shutting down the computer Index ...................................................................................................................................................................
1 Setting power options Using power-saving states The computer has two power-saving states enabled at the factory: Sleep and Hibernation. When Sleep is initiated, the power lights blink and the screen clears. Your work is saved to memory, letting you exit Sleep faster than exiting Hibernation. If the computer is in the Sleep state for an extended period or if the battery reaches a critical battery level while in the Sleep state, the computer initiates Hibernation.
When the computer exits Sleep, the power lights turn on and your work returns to the screen where you stopped working. NOTE: If you have set a password to be required on wakeup, you must enter your Windows password before your work will return to the screen.
Using the battery meter The battery meter is located in the notification area, at the far right of the taskbar. The battery meter allows you to quickly access power settings, view remaining battery charge, and select a different power plan. ● To display the percentage of remaining battery charge and the current power plan, move the pointer over the battery meter icon. ● To access Power Options, or to change the power plan, click the battery meter icon and select an item from the list.
Using power plans A power plan is a collection of system settings that manages how the computer uses power. Power plans can help you conserve power or maximize performance. You can change power plan settings or create your own power plan. Viewing the current power plan ▲ Move the pointer over the battery meter icon in the notification area, at the far right of the taskbar. – or – Select Start > Control Panel > System and Maintenance > Power Options.
Setting password protection on wakeup To set the computer to prompt for a password when the computer exits Sleep or Hibernation, follow these steps: 1. Select Start > Control Panel > System and Maintenance > Power Options. 2. In the left pane, click Require a password on wakeup. 3. Click Change Settings that are currently unavailable. NOTE: 4. If prompted by User Account Control, click Continue. Click Require a password (recommended).
2 Using external AC power External AC power is supplied through one of the following devices: WARNING! To reduce potential safety issues, use only the AC adapter provided with the computer, a replacement AC adapter provided by HP, or a compatible AC adapter purchased from HP. ● Approved AC adapter ● Optional docking device or expansion product Connect the computer to external AC power under any of the following conditions: WARNING! Do not charge the computer battery while you are onboard aircraft.
Connecting the AC adapter WARNING! To reduce the risk of electric shock or damage to the equipment: Plug the power cord into an AC outlet that is easily accessible at all times. Disconnect power from the computer by unplugging the power cord from the AC outlet (not by unplugging the power cord from the computer). If provided with a 3-pin attachment plug on the power cord, plug the cord into a grounded (earthed) 3pin outlet.
3 Using battery power When a charged battery is in the computer and the computer is not plugged into external power, the computer runs on battery power. When the computer is plugged into external AC power, the computer runs on AC power. If the computer contains a charged battery and is running on external AC power supplied through the AC adapter, the computer switches to battery power if the AC adapter is disconnected from the computer.
Finding battery information in Help and Support The Battery information section of the Help and Support Learning Center provides the following tools and information: ● Battery Check tool to test battery performance ● Information on calibration, power management, and proper care and storage to maximize battery life ● Information on battery types, specifications, life cycles, and capacity To access Battery information: ▲ Select Start > Help and Support > Learning Center > Battery information.
Using Battery Check Battery Check, a part of the Total Care Advisor, provides information on the status of the battery installed in the computer. To run Battery Check: 1. Connect the AC adapter to the computer. NOTE: The computer must be connected to external power for Battery Check to function properly. 2. Select Start > Help and Support > Troubleshooting tools > Battery Check.
Displaying the remaining battery charge ▲ Move the pointer over the battery meter icon in the notification area, at the far right of the taskbar. – or – View the estimated number of minutes of battery charge remaining in Windows Mobility Center: ▲ Click the battery meter icon, and then click Windows Mobility Center. – or – Select Start > Control Panel > Mobile PC > Windows Mobility Center.
Inserting or removing the battery CAUTION: Removing a battery that is the sole power source can cause loss of information. To prevent loss of information, initiate Hibernation or shut down the computer through Windows before removing the battery. To insert the battery: 1. Turn the computer upside down on a flat surface. 2. Insert the battery into the battery bay (1) and rotate it downward until it is seated (2). The battery release latch (3) automatically locks the battery into place.
Charging a battery WARNING! Do not charge the computer battery while you are onboard aircraft. The battery charges whenever the computer is plugged into external power through an AC adapter, an optional power adapter, an optional expansion product, or an optional docking device. The battery charges whether the computer is off or in use, but it charges faster when the computer is off.
Maximizing battery discharge time Battery discharge time varies depending on the features you use while on battery power. Maximum discharge time gradually shortens, as the battery storage capacity naturally degrades. Tips for maximizing battery discharge time: 14 ● Lower the brightness on the display. ● Check the Power saver setting in Power Options. ● Remove the battery from the computer when it is not being used or charged. ● Store the battery in a cool, dry location.
Managing low battery levels The information in this section describes the alerts and system responses set at the factory. Some lowbattery alerts and system responses can be changed using Power Options in Windows Control Panel. Preferences set using Power Options do not affect lights. Identifying low battery levels When a battery that is the sole power source for the computer reaches a low battery level, the battery light blinks.
Resolving a low battery level CAUTION: To reduce the risk of losing information when the computer reaches a critical battery level and has initiated Hibernation, do not restore power until the power lights turn off. Resolving a low battery level when external power is available ▲ Connect one of the following devices: ● AC adapter ● Optional expansion product or docking device ● Optional power adapter Resolving a low battery level when a charged battery is available 1.
Calibrating a battery Calibrate a battery under the following conditions: ● When battery charge displays seem inaccurate ● When you observe a significant change in battery run time Even if a battery is heavily used, it should not need to be calibrated more than once a month. It is also not necessary to calibrate a new battery. Step 1: Fully charge the battery WARNING! Do not charge the computer battery while you are onboard aircraft.
Step 3: Discharge the battery The computer must remain on while the battery is being discharged. The battery can discharge whether or not you are using the computer, but the battery will discharge faster while you are using it. ● If you plan to leave the computer unattended during the discharge, save your information before beginning the discharge procedure.
Step 4: Fully recharge the battery To recharge the battery: 1. Plug the computer into external power and maintain external power until the battery is fully recharged. When the battery is recharged, the battery light on the computer turns off. You can use the computer while the battery is recharging, but the battery will charge faster if the computer is off. 2. If the computer is off, turn it on when the battery is fully charged and the battery light has turned off.
Conserving battery power 20 ● Select low power-use settings through Power Options in Windows Control Panel. ● Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them. ● Disconnect external devices that are not plugged into an external power source, when you are not using them. ● Stop, disable, or remove any external media cards that you are not using. ● Use the fn+f7 and fn+f8 hotkeys to adjust screen brightness as needed.
Storing a battery CAUTION: of time. To prevent damage to a battery, do not expose it to high temperatures for extended periods If a computer will be unused and unplugged from external power for more than 2 weeks, remove the battery and store it separately. To prolong the charge of a stored battery, place it in a cool, dry place. NOTE: A stored battery should be checked every 6 months. If the capacity is less than 50 percent, recharge the battery before returning it to storage.
Disposing of a used battery WARNING! To reduce the risk of fire or burns, do not disassemble, crush, or puncture a battery; short the external contacts on a battery; or dispose of a battery in fire or water. Do not expose a battery to temperatures above 60˚C (140˚F). Replace the battery only with a battery approved for this computer. Refer to the Regulatory, Safety and Environmental Notices for battery disposal information.
Replacing the battery Computer battery life varies, depending on power management settings, programs running on the computer, display brightness, external devices connected to the computer, and other factors. Battery Check notifies you to replace the battery when an internal cell is not charging properly, or when the battery storage capacity has reached a ”weak” condition. A message refers you to the HP Web site for more information about ordering a replacement battery.
4 Shutting down the computer CAUTION: Unsaved information will be lost when the computer is shut down. The Shut Down command closes all open programs, including the operating system, and then turns off the display and computer.
Index A AC adapter, connecting B battery calibrating 17 charging 13, 17 conserving power discharging 14 disposing 22 inserting 12 low battery levels recharging 19 removing 12 replacing 23 storing 21 Battery Check 10 battery light 13, 15 battery power 8 battery release latch battery temperature 7 L low battery level 15 O operating system 20 15 12 21 C calibrating battery 17 charging batteries 13, 17 connection, external power 7 conservation, power 20 critical battery level 15 D drive media 1 24 P
