Panasonic CF-73 Series Reference Manual page 39

Battery Power
1
Connect the AC adaptor.
2
Close all applications.
3
Perform Battery Recalibration.
"
A Select [start] - [All Programs] - [Panasonic] - [Battery Recalibration].
B At the confirmation message, select [Start].
Performing "Battery Recalibration" at frequent intervals degrades the battery.
As a general guideline, perform Battery Recalibration once every three
months.
A message urging caution will appear when "Battery Recalibration" is to be
performed again in less than a month or so since it was last performed. In a
case like this, do not perform "Battery Recalibration."
C
The display will ask you to shut down Windows. Select [Yes].
"Battery Recalibration" will begin.
After the battery pack is fully charged, discharging begins. When the
discharging is completed, the power automatically goes off.
When "Battery Recalibration" is completed, charging begins.
NOTE
"Battery Recalibration" can also be performed by following the procedure below.
A Restart the computer.
Press F9 while the [Panasonic] boot screen is displayed a few moments after the
B
computer begins the startup procedure.
When the remaining battery capacity is displayed, press Enter.
C
D
Follow the on-screen instructions.
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