Calibrating A Battery Pack - HP Pavilion DV4000 Hardware And Software Manual

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
percentage 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
"Monitoring the Charge in a Battery Pack,"
chapter.
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