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62
Computing
Charging the RTC battery
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 a CMOS error
message during startup. The error message may vary by
computer model.
NOTE
To recharge the RTC battery, plug the computer into a live
electrical outlet and leave the computer powered on for 24
hours.
NOTE
The computer can be used while the RTC battery is being
charged, although the charging status of the RTC battery
cannot be monitored.
Depending on your system, the RTC battery may only
charge while the computer is turned on.
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.
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