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The RTC battery does not charge while the computer is turned off even when the AC adaptor is charging the computer. The RTC battery charges when the computer is powered on. If the RTC battery is low, the real-time clock and calendar may display the incorrect time and date, or stop working. To recharge the RTC battery, plug the computer into a live electrical outlet and leave the computer powered on for 24 hours. 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. The following also applies to the secondary battery (available on certain models) if installed. . Glows amber while the main battery is being charged (AC adaptor connected). . Glows blue when the main battery is fully charged. . Is unlit when the battery has discharged, the battery is not charging, or the AC adaptor is not plugged into the computer or AC outlet. 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. Mobile Computing 100 Monitoring main battery power 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. Disconnect the AC power cord/cable and remove the battery pack. See “Changing the main battery” on page 106 for information on replacing the main battery. HINT: Be careful not to confuse the battery light ( ) with the on/off light ( ). When the on/off light flashes amber, it indicates that the system is suspended (using the Windows® operating system Sleep command). Power button System Indicator Lights AC power light Battery light Hard disk drive light Bridge Media Adapter light (on certain models only) On/off light (Sample Illustration) Power and battery light locations Mobile Computing 101 Monitoring main battery power Determining remaining battery power Wait at least 16 seconds after turning on the computer before trying NOTE to monitor the remaining battery power. The computer needs this time to check the battery’s remaining capacity and perform its calculations. Highlight the power icon in the Notification Area. A pop-up message displays the remain...

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