Panasonic CF-29 Series Reference Manual page 50

Battery Power
Accurately Displaying Battery Capacity
2
Set alarm operations and remaining battery level for operating alarm functions.
When disabling the speaker by pressing Fn+F4, the sound alarm is also
disabled.
A. When making a setting for [When the alarm goes off, the computer will] in
[Alarms] - [Alarm Action]:
Windows XP
Add a check mark for [Force stand by or shutdown even if a program stops
responding].
Windows 2000
Add a check mark for [Force standby or shutdown even if a program stops
responding].
B. Set the value for [Critical battery alarm] to 5% or more.
This is necessary for the standby or hibernation function to be completed
(assuring data is saved) when the battery level is low.
The battery pack has a function for measuring, storing and learning about battery capacity.
Using this function properly to accurately display remaining battery capacity requires 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.
NOTE
The [Refresh Battery] function takes time
capacity; this is not a malfunction.
*1
This process takes approximately 15 hours (when the second battery pack has been inserted in
addition to the main battery: approximately 24 hours) at most, but the time may differ depending on
the battery power remaining when the [Refresh Battery] function is initiated.
If the computer is turned off while refreshing the battery (electrical power outage,
accidental removal of the AC adaptor or battery pack, etc.), the battery will not be
refreshed correctly.
Depending on the battery status, the battery pack may be discharging temporarily
while "Charging..." is displayed.
*1
to execute because of the large battery
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