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. Glows blue or green (depending on your model) 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. 98 Mobile Computing Monitoring main battery power 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 104 for information on replacing the main battery. HINT: Be careful not to confuse the battery light ( ), the on/off light ( ), and the power button light (at the top-left side 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). (Sample Illustration) Power and battery light locations NOTE Power button System Indicator Lights AC power light Battery light Hard disk drive light On/off light Bridge Media Adapter Slot light (available on certain models) Mobile Computing 99 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. 1 Highlight the power icon 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. 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 . Place the computer into Hibernation mode and replace the main battery with a charged spare . Connect the computer to an optional secondary battery (if available for your computer) . 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...

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