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Mobile Computing
Charging batteries
5.375 x 8.375 ver 2.3.2
❖ The battery is almost completely discharged.
Leave the power connected and the battery should begin
charging after a few minutes.
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.
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 the following
error message during startup:
BAD RTC BATTERY
BAD CHECKSUM (CMOS)
CHECK SYSTEM
The above error message may vary by computer model.
The RTC battery does not charge while the computer is turned
off even when the AC adaptor is charging the computer. The
RTC battery charges when the computer is powered on.
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 the computer into a live
electrical outlet and leave the computer powered on for 24
hours.
NOTE