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Power Management
User Guide


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    Power Management User Guide...

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    © 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.

  • Page 3: Product Notice

    Product notice This user guide describes features that are common to most models. Some features may not be available on your computer.

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    Product notice...

  • Page 5: Table Of Contents

    Table of contents 1 Power control and light locations 2 Shutting down the computer 3 Setting power options Using power-saving states ........................4 Initiating and exiting Sleep ....................4 Initiating and exiting Hibernation ..................4 Using the battery meter ........................6 Using power plans ..........................

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    Storing a battery ..........................20 Disposing of a used battery ........................ 21 5 Using external AC power Connecting the AC adapter ........................ 23 Index ................................... 24...

  • Page 7: Power Control And Light Locations

    Power control and light locations The following illustration and table identify and describe the power control and light locations. NOTE: Your computer may look slightly different from the illustration in this section. Component Description Power button ● When the computer is off, press the button to turn on the computer.

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    Component Description ● Power light On: The computer is on. ● Blinking: The computer is in the Sleep state. ● Blinking rapidly: An AC adapter with a higher power rating should be connected. ● Off: The computer is off or in Hibernation. fn+f5 Initiates Sleep.

  • Page 9: Shutting Down The Computer

    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. Shut down the computer under any of the following conditions: ●...

  • Page 10: Setting Power Options

    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 light blinks 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.

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    Power settings and timeouts can be changed using Power Options in Windows Control Panel. To initiate Hibernation: Click Start, and then click the arrow next to the Lock button. Click Hibernate. To exit Hibernation: Press the power button briefly. ▲ The power light turns on and your work returns to the screen where you stopped working.

  • Page 12: Using The Battery Meter

    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. ●...

  • Page 13: Using Power Plans

    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.

  • Page 14: Setting Password Protection On Wakeup

    Setting password protection on wakeup To set the computer to prompt for a password when the computer exits Sleep or Hibernation, follow these steps: Select Start > Control Panel > System and Maintenance > Power Options. In the left pane, click Require a password on wakeup. Click Change Settings that are currently unavailable.

  • Page 15: Using Battery Power

    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.

  • Page 16: Finding Battery Information In Help And Support

    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 ●...

  • Page 17: Displaying The Remaining Battery Charge

    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.

  • Page 18: Inserting Or Removing The Battery

    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: Turn the computer upside down on a flat surface, with the battery bay toward you.

  • Page 19: Charging A Battery

    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.

  • Page 20: Managing Low Battery Levels

    Managing low battery levels The information in this section describes the alerts and system responses set at the factory. Some low- battery 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.

  • Page 21: Resolving A Low Battery Level

    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 light turns off. Resolving a low battery level when external power is available Connect one of the following devices: ▲...

  • Page 22: Calibrating A Battery

    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.

  • Page 23: Step 3: Discharge The Battery

    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.

  • Page 24: Step 4: Fully Recharge The Battery

    Step 4: Fully recharge the battery To recharge the battery: 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.

  • Page 25: Conserving Battery Power

    Conserving battery power ● 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.

  • Page 26: Storing A Battery

    Storing a battery CAUTION: To prevent damage to a battery, do not expose it to high temperatures for extended periods of time. If a computer will be unused and unplugged from external power for more than 2 weeks, remove the battery and store it separately.

  • Page 27: Disposing Of A Used Battery

    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).

  • Page 28: Using External Ac Power

    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. ●...

  • Page 29: Connecting The Ac Adapter

    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).

  • Page 30: Index

    Index AC adapter, connecting 23 lights battery 2 power 2 battery low battery level 14 calibrating 16 charging 13, 16 conserving power 19 operating system 3 disposing 21 inserting 12 power low battery levels 14 connecting 23 recharging 18 conserving 19 removing 12 control and light locations 1 storing 20...

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