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The battery may not start charging immediately under the
following conditions:
❖
The battery is extremely hot or cold.
To ensure that the battery charges to its full capacity, wait until
it reaches room temperature.
❖
The battery is almost completely discharged.
Leave the power connected and the battery should begin
charging after a few minutes.
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
NOTE
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, connect the computer and leave
it powered on for 24 hours.
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 adapter is charging the computer.
Mobile Computing
Charging the batteries
111
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