108 Mobile Computing
Monitoring battery power
5.375 x 8.375 ver 2.3
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
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.
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.
NOTE
NOTE