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. The battery is almost completely discharged. Leave the power connected, and the battery should begin charging after a few minutes. HINT: Once a battery is fully charged, we recommend that you operate your computer on battery power until the battery discharges completely. Doing this extends battery life and helps ensure accurate monitoring of battery capacity. Charging the RTC battery The computer contains an internal battery that provides power for the real-time clock (RTC) and calendar. During normal use, the main battery keeps the RTC battery adequately charged. Occasionally, the RTC battery may lose its charge completely, especially if you have had the computer turned off for a long time. 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 in the computer and leave it turned off for at least 24 hours. NOTE: When Hibernation mode is enabled and the RTC battery is completely discharged, a warning prompts you to reset the real- time clock. 98 98 Mobile Computing Monitoring battery power Monitoring battery power The battery light indicates the primary battery’s current charge. The Modular Bay light indicates the charge state of the secondary battery (if used). In both cases, the indicator light: . Glows green when the battery is fully charged . Glows amber while the battery is being charged . Does not glow if the external power source is disconnected or if the battery is completely discharged Determining remaining battery power NOTE: Wait at least 16 seconds 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. 1 Click Start, then click Control Panel. 2 Click the Toshiba Power Management icon. The current power source and battery power remaining section displays the current charge state of the battery. The value displays as a percentage of remaining battery charge. 3 Click the Battery Power Meter tab. Mobile Computing 99 Monitoring 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. Conserving battery power How long a fully charged battery 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 display panel instead of an external monitor . How much you use the hard disk and other drives . Whether you use any optional devices to which the battery supplies power, such as a PC Card . Where you are working—since operating time decreases at low tem...

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