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117
Power Management
Running the computer on battery power
Charging the batteries
To charge the main battery while it is in your computer, plug the
computer into a live electrical outlet. The battery charges whether
the computer is on or off. It takes approximately three hours to
charge the battery with the computer turned off, or up to 10 hours
when the computer is on.
The main battery light (
) glows amber while the battery is
being charged, and glows green when it is fully charged.
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.
The main battery charges the backup and RTC batteries.
During normal use, the main battery keeps the other batteries
adequately charged. Occasionally, the backup and RTC batteries
may lose their charge completely, especially if you’ve had the
computer turned off for a long time. To recharge:
❖
The backup battery, plug the computer in and leave it turned
off for two and a half to five hours.
❖
The RTC battery, plug the computer in and turn it on for at
least 24 hours.
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