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The RTC battery may have become completely discharged while your computer was shipped, resulting in a CMOS error message during startup. The error message may vary by computer model. NOTE Depending on your system, the RTC battery may only charge while the computer is turned on. To recharge the RTC battery, plug the computer into a live electrical outlet and leave the computer powered on for 24 hours. Mobile Computing Mobile Computing Monitoring main battery power NOTE It is seldom necessary to charge the RTC battery because it charges while the computer is on. If the RTC battery is low, the real-time clock and calendar may display the incorrect time and date or stop working. When Hibernation mode is enabled and the RTC battery is completely discharged, a warning prompts you to reset the real-time clock. The computer can be used while the RTC battery is being charged, although the charging status of the RTC battery cannot be monitored. Monitoring main battery power The computer’s main battery light gives you an indication of the main battery’s current charge. . Glows amber while the main battery is being charged (AC adaptor connected) . Glows white when the main battery is fully charged NOTE Battery life and charge time may vary, depending upon power management settings, applications and features used. . Flashes amber when the main battery charge is low and it is time to recharge the main battery or plug in the AC adaptor NOTE If the AC power light flashes amber during charging, either a battery pack is malfunctioning, or it is not receiving correct input from the AC power supply. 80 80 80g Monitoring main battery power HINT: Be careful not to confuse the battery light ( ), the ON/OFF light ( ), and the power button light near the upper-right corner of the keyboard. When the ON/OFF light or power button light flashes amber, it indicates that the system is suspended (using the Windows® operating system Sleep command). System indicator lights AC power light/Battery light Wireless indicator light ON/OFF light (Sample Illustration) Power and battery light locations Determining remaining battery power NOTE Wait a few moments after turning on the computer before trying to monitor the remaining battery power. The computer needs this time to check the battery’s remaining capacity and perform its calculations. Move the pointer over the power icon in the notification area, see “Finding your way around the desktop” on page 89 for more information on the notification area. A pop-up message displays the remaining battery power as a percentage. With repeated discharges and recharges, the battery’s capacity gradually decreases. A frequently used older battery does not power the computer for as long as a new battery, even when both are fully charged. Mobile Computing Mobile Computing Monitoring main battery power TECHNICAL NOTE: The computer drains the battery faster at low temperatures. Check your remaining charge frequently if you are working in temperatures below 50 degrees Fahrenheit. The computer calculates the remaining battery charge based on your current rate of power use and other factors such as the age of the battery. What to do when the main battery runs low When the main battery runs low you can: . Plug the computer into an external power source and recharge the main battery . Save your work and turn off the computer If you do not manage to do any of these things before the main battery completely runs out of power, the computer automatically enters Hibernation mode and turns itself off. Hibernation mode keeps track of where you were, so that when you turn on the power again, you can continue where you left off. Setting battery notifications You can set two notifications. Each notification can be set to alert you when a specified percentage of remaining battery power has been reached. You can also set the computer to enter Sleep mode or Hibernation mode or to completely shut down when the notification goes off. To change the default notification settings: 1 While on the desktop, click the battery ( ) icon in the notification area. 2 Click More power options. The Power Options window appears. 3 Click Change plan settings under the power plan to be customized. The Edit Plan Settings window appears. 82 82 4 5 Click Change advanced power settings. The Advanced settings tab of the Power Options window appears. Double-click Battery to display the battery options. (Sample Image) Advanced settings tab of Power Options screen 6 Configure the alarm settings to suit your needs. Conserving battery power How long a fully charged battery pack lasts when you are using the computer depends on a number of factors, such as: . How the computer is configured . How much you use the internal storage drive or other optional devices . Where you are working, since operating time decreases at low temperatures There are various ways in which you can conserve power and extend the operating time of your battery: . Enable Sleep or Hibernati...

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