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Mobile Computing
Charging batteries
Charging the main and secondary batteries
To charge the main battery, plug the computer into a live wall
outlet. It takes several hours to charge the battery with the
computer off. It takes much longer to charge the battery while the
computer is on.
TECHNICAL NOTE: The battery does not charge while the
computer is consuming full power.
To charge the secondary battery, fit it in the Modular Bay and
connect the computer to an AC power source.
A battery may not start charging immediately if:
The battery is extremely hot or cold.
To ensure that the battery charges to its full capacity, wait until
it reaches room temperature (50 to 80 degrees Fahrenheit, 10
to 26 degrees Celsius).
The battery is almost completely discharged.
Leave the power connected, and the battery should begin
charging after a few minutes.
HINT: Once a 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.
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