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Mobile Computing
User's Manual
4-4
Satellite P20
Version
1
Last Saved on 30/05/2003 13:57
ENGLISH using Euro_M.dot –– Printed on 30/05/2003 as T202014-EN
Charging the RTC battery
In addition to the main battery, the computer contains an internal battery
for the real-time clock (RTC). The RTC battery provides power for the
internal real-time clock 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 and without the main
battery pack inserted for a long time. In this event, your computer
displays the following error message:
ERROR 0271: Check data and time settings WARNING 0251: System
CMOS checksum bad - Default configuration used Press <F1> to
resume, <F2> to Setup.
It is seldom necessary to charge the RTC battery because it charges
while the computer is on. However, 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 the AC adapter into the computer for
at least 24 hours.
The computer can be used while the RTC battery is being charged.
Although the charging status of the RTC battery cannot be monitored, if
the power is on, it takes approximately 24 hours to fully charge the RTC
battery.