Panasonic CF-71 Reference Manual page 15

Battery Power
When the remaining battery charge becomes low
Save your data and power off your computer
Following that:
Plug in the AC adapter, and fully charge your battery.
Use a spare battery if you have one.
If you have neither the AC adapter nor an extra battery, power the computer off.
Power settings, e.g., warning* for a low battery level, can be made in
[Control Panel] - [Power Options].
* When disabling the speakers with the Setup Utility (or pressing
[Sound alarm] is not heard.
CAUTION
Alarm Settings (in [Control Panel] - [Power Options] - [Alarms])
Set the value for the [Critical battery alarm] to 4% or more. This is necessary
for the suspend or hibernation function to be completed (assuring data is saved)
when the battery level is low.
When making a setting for [When the
alarm goes off, the computer will:] in
[Alarms]-[Alarm Action], add a check mark
to [Force standby or shutdown even if a
program stops responding].
If the computer shuts down or enters the
suspend or hibernation mode by the
Alarm settings function, start up the com-
puter or resume operations after connect-
ing the AC adapter. If the computer starts
up or resumes while the AC adapter is
not connected, Windows may not oper-
ate properly or alarm operations may stop
working.
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