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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.
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
If the RTC battery is low, the real-time clock and calendar
may display the incorrect time and date, or stop working.
NOTE
The computer can be used while the RTC battery is being
charged, although the charging status of the RTC battery
cannot be monitored.
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.
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.
Mobile Computing
Charging the batteries
105
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