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104
Mobile Computing
Charging the battery
Leave the power connected, and the battery should begin
charging after a few minutes.
Charging the RTC battery
The computer contains an internal battery that provides
power for the real-time clock (RTC) 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 for a long time.
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 in the computer and leave
it turned off for at least 48 hours.
HINT: Once the battery is fully charged, we recommend that
you operate your computer on battery power until the battery
discharges completely. Doing this extends battery life and
helps ensure accurate monitoring of battery capacity.
When Hibernate mode is enabled and the RTC battery is
completely discharged, a warning prompts you to reset the
real-time clock.
TECHNICAL NOTE: The RTC battery does not charge while the
computer is turned off, even when AC power is attached.
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