Real Time Clock Battery - Toshiba Equium A110-233 User Manual

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The battery pack is a lithium ion battery, which can explode if not
properly replaced, used, handled or disposed of. Dispose of the battery
as required by local ordinances or regulations. Use only batteries
recommended by TOSHIBA as replacements.
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Do not remove the battery pack while the computer is in Standby Mode.
In this mode data is stored in memory, so if the computer loses power, it
will be lost.
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Battery type (depending on the model you purchased):
4 cell-PA3451U-1BRS,PA3451U-1BAS*
6 cell-PA3465U-1BRS,PA3465U-1BAS
8 cell-PA3457U-1BRS,PA3457U-1BAS
* The availability of this battery is dependent on the model you purchased.

Real Time Clock battery

The Real Time Clock (RTC) battery provides power for the internal real
time clock and calendar. It also maintains the system configuration.
If the RTC battery becomes completely discharged, the system loses this
data and the real time clock and calendar stop working. The following
message appears when you turn on the power:
The computer's RTC battery is a lithium battery and should be replaced
only by your dealer or by a TOSHIBA service representative. The battery
can explode if not properly replaced, used, handled or disposed of.
Dispose of the battery as required by local ordinances or regulations.
User's Manual
ERROR 0271:Check date and time settings.
WARNING 0251:System CMOS checksum bad - Default
configuration used.
Press <F1> to resume, <F2> to Setup.
Power and Power-Up Modes
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