Panasonic Toughbook CF-28 Series Reference Manual page 33

Battery Power
Accurately Displaying Battery Capacity
The battery pack has a function for measuring, storing, and learning about battery ca-
pacity. Using this function properly to accurately display remaining battery capacity re-
quires that the battery pack be fully charged (charged to 100%), then fully discharged,
and then fully charged again.
This procedure should be performed once after you purchase the computer. As you use
the battery pack over a long period of time, the remaining capacity display may become
inaccurate due to aging of the battery pack and other factors. The procedure described
below should be repeated.
1
Attach the battery pack, then connect the AC adaptor
Remove all peripherals (except for the battery pack and AC adaptor).
2
Use the "Refresh Battery" utility to fully discharge the battery
pack
1 Run the Setup Utility. (
2 Select [Refresh Battery] from the [Exit] menu and then press Enter .
3 At the confirmation message, select [Yes] and then press Enter .
Once the battery indicator turns green, the battery pack will be completely dis-
charged. It takes approximately 3.5 hours* until the power automatically goes off
through the complete discharge of the battery from the fully charged state.
* When the second battery has been installed in addition to the main battery: approxi-
mately 6 hours
NOTE
If the computer is turned off (electrical power outage, accidental removal of the
AC adaptor or battery pack, etc.), the battery will not be refreshed correctly.
3
Allow the battery pack to charge until the battery indicator turns
green
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