Panasonic CF-M34 Series Toughbook Reference Manual page 24

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 performed again.
1
Attach the battery pack and 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 If [Environment] in [Main] menu is set to [High Temperature], set [Environment] to
[Normal Temperature], then select [Save Current Values] from [Exit] menu and
select [Yes], and then press Enter .
3 Select [Refresh Battery] from [Exit] menu, then press Enter .
4 At the confirmation message, select [Yes], then press Enter .
The battery pack will be completely charged and discharged, the computer will
power off automatically, and then charging will commence. It takes approximately
3 hours until the power automatically goes off through the complete discharge of
the battery from the fully charged state.
NOTE
If the computer is turned off (electrical power outage, accidental removal of the
AC adaptor, etc.), the battery will not be refreshed correctly.
5 If [Environment] in [Main] menu is changed at step 2, run the Setup Utility and
set [Environment] to [High Temperature], then press F10 and select [Yes], and
then press Enter .
3
Allow the battery pack to charge until the battery indicator turns
green
Charging Time: Approximately 2.5 hours
page 39)
24