3–18 Hardware and Software Guide
Power
Calibrating a Battery Pack
When to Calibrate
Even if a battery pack is heavily used, calibration should be
necessary only once a month. You do not have to calibrate a new
battery pack before first use.
Calibration does not usually increase battery run time, but it can
increase the accuracy of battery charge displays, especially under
the following conditions:
■ When the battery pack has been unused for one month
or
more.
■ When the notebook has been running primarily on
external
power (and rarely on battery power) for more
than
one month.
■ When battery charge displays report large changes in the
percent of power remaining within 2 minutes. For example,
if
the Power Meter displays 20 percent of a full charge
remaining and then less than 2 minutes later displays only
5
percent of a full charge remaining, the rapid drop in charge
remaining indicates that the battery pack needs calibration.
For more information about battery charge displays, refer to
the
“Monitoring the Charge in a Battery Pack” section earlier
in this chapter.
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