[. . . ] Notebook PC User Guide © Copyright 2010 Hewlett-Packard Development Company, L. P. ATI and ATI Mobility Radeon are trademarks of Advanced Micro Devices, Inc. Bluetooth is a trademark owned by its proprietor and used by Hewlett-Packard Company under license. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. [. . . ] Preferences set using Power Options do not affect lights. Identifying low battery levels If a low battery level is not resolved, the computer enters a critical battery level. The computer takes the following actions for a critical battery level: If Hibernation is enabled and the computer is on or in Sleep, the computer initiates Hibernation. If Hibernation is disabled and the computer is on or in Sleep, the computer remains briefly in Sleep, and then shuts down and loses any unsaved information. 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. 42 Chapter 5 Power management Resolving a low battery level when external power is available To resolve 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 To resolve a low battery level when a charged battery is available: 1. Turn on the computer. Resolving a low battery level when no power source is available To resolve a low battery level when no power source is available, initiate Hibernation or save your work and then shut down the computer. Resolving a low battery level when the computer cannot exit Hibernation To resolve a low battery level when the computer cannot exit Hibernation: 1. Press the Power button to exit Hibernation. Calibrating a battery Calibrate the battery when: The battery charge displays seem inaccurate. You observe a significant change in battery run time. A heavily used battery should only be calibrated once a month. Do not charge the computer battery while on board an aircraft. NOTE: The battery charges while the computer is off or in use, but it charges faster when the computer is off. Using battery power 43 To fully charge the battery: a. Connect the computer to an AC adapter, optional power adapter, optional expansion product, or optional docking device, and then connect the adapter or device to an external power source. Leave the computer connected to external power until the battery is fully charged. c. Click the Battery Meter icon in the notification area, and then click More power options. ­ or ­ Select Start > Control Panel > System and Security > Power Options. Record the Turn off the display settings listed in the On battery column so they can be reset after the calibration. Click the plus sign next to Sleep, and then click the plus sign next to Hibernate after. Record the On battery setting under Hibernate so it can be reset after the calibration. Disconnect the computer from the external power source, but do not shut down the computer. Run the computer on battery power until the battery is discharged. The computer must remain on while the battery is being discharged. The battery discharges whether or not you are using the computer, but the battery discharges 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. If you use the computer occasionally during the discharge procedure and have set energysaving timeouts, expect the following performance from the system during the discharge process: The monitor does not shut down automatically. The hard drive speed does not decrease automatically when the computer is idle. System-initiated Hibernation does not occur. 44 Chapter 5 Power management 4. Recharge the battery. [. . . ] If both the computer display and an external display are on, press the Switch Screen Image key one or more times to switch between the 2 displays. Configure the monitor settings to make the external display primary: a. Right-click on a blank area of the computer desktop, and select Screen resolution. Specify a primary display and a secondary display. NOTE: When using both displays, the movie image does appear on any display designated as the secondary display. [. . . ]