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6-4
User's Manual
POWER AND
POWER-UP MODES
Before you remove the battery pack, set the computer to Hibernation mode or save
your data and shut down the computer. Do not change the battery pack while the
universal AC adaptor is connected.
CAUTIONS: 1. 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 recom-
mended by TOSHIBA as replacements.
2. Do not remove the battery pack while the computer is
in Standby mode. Data is stored in RAM, so if the
computer loses power it will be lost. When the com-
puter is powered off in Standby mode, and the
universal AC adaptor is not connected, the battery
pack supplies power to maintain data and program in
memory. If the battery pack is completely discharged,
Standby mode does not function and the computer
loses all data in memory.
To ensure that the battery pack maintains its maximum capacity, operate the
computer on battery power at least once a month until the battery pack is fully
discharged. Refer to Extending battery life in this chapter for procedures. If the
computer is continuously operated on AC power through a universal AC adaptor
for an extended period, more than a month, the battery may fail to retain a charge. It
may not function efficiently over the expected life of the battery and the Battery
indicator may not indicate a low-battery condition.
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:
**** RTC battery is low or CMOS checksum is inconsistent ****
Press [F1] key to set Date/Time.