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Mobile Computing
Charging batteries
TECHNICAL NOTE: The recharging of the battery may 
not occur when your computer is using all of the power 
provided by the AC adaptor to run applications, features, 
and devices. Your computer's Power Options utility can 
be used to select a power level setting that reduces the 
power required for system operation and will allow the 
battery to recharge.
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 (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 the battery is fully charged, we recommend 
that you periodically operate your computer on battery 
power until the battery discharges completely.
Please make a complete back up of your data to external 
media before discharging the battery. For more 
information, see 
.
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 a CMOS error 
message during startup. The error message may vary by 
computer model.