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Leave the power connected, and the battery should begin charging after a few minutes. HINT: Once the 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 Your computer has an internal real-time clock (RTC) battery. The RTC battery powers the System Time Clock and BIOS memory used to store your computer’s configuration settings. When fully charged, it maintains this information for up to a month when the computer is powered off. Mobile Computing Mobile Computing Monitoring battery power The RTC battery may have become completely discharged while your computer was shipped, resulting in the following error message during startup: BAD RTC BATTERY BAD CHECKSUM (CMOS) CHECK SYSTEM NOTE The above error message may vary by computer model. The RTC battery does not charge while the computer is turned off even when the AC adapter is charging the computer. If the RTC battery is low, the real-time clock and calendar may display the incorrect time and date, or stop working. 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 battery power The computer’s main battery light gives you an indication of the main battery’s current charge: . Green indicates the AC adapter has fully charged the battery. . Amber indicates the AC adapter is charging the battery. Mobile Computing Mobile Computing Monitoring battery power . Off indicates that the battery is not being charged. NOTE Battery life and charge time may vary, depending upon power management settings, applications and features used. . Flashing amber indicates that the computer is using battery power, and the battery’s charge is running low. HINT: Be careful not to confuse the battery light ( ), the on/ off light ( ), and the power button light (above the keyboard). When the on/off light and power button light flash amber, it indicates that the system is suspended (using Windows® XP Standby command). on/off light battery light power button light Sample power and battery light locations Mobile Computing Mobile Computing Monitoring battery power Displaying remaining battery power You can monitor the battery’s remaining charge. The computer calculates the remaining battery charge as it operates, based on your current rate of power use. To show remaining power: 1 Click Start, Control Panel, Performance and Maintenance, and then Toshiba Power Saver. The Toshiba Power Saver Properties dial...

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