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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. Mobile Computing Mobile Computing Monitoring main battery power 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 green 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. 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 116 for information on replacing the main battery. Mobile Computing Mobile Computing 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-left 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). Power button System indicator lights** AC power light Battery light Internal storage drive light Memory card reader light ON/OFF light *Available on certain models Numeric Wireless indicator light overlay light* Cursor control overlay light* **Appearance may vary (Sample Illustration) Power and battery light locations Mobile Computing Mobile Computing 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. Move the pointer over the power icon in the notification area, see “Finding your way around the desktop” on page 124 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. TECHNICAL NOTE: The computer drains the battery faster at low temperatures. Chec...

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