Panasonic Toughbook CF-74JCL02AM Reference Manual page 17

Battery Power
Computer behavior with low battery
The default settings are as follows.
When the battery level becomes 10%
[Low battery alarm]
Displays a message that the battery level is low.
Charge the battery.
Connect the AC adaptor immediately. If you do not
have the AC adaptor, exit the running programs and
Windows, then confirm that the power indicator is off.
If you have a fully charged spare battery, turn off the
computer, replace the battery and turn the computer on
again.
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When the battery level becomes 5%
[Critical battery alarm]
Displays a message that the battery level is low, and
then the computer enters hibernation.
Connect the AC adaptor or replace the battery to start up
the computer.
Connect the AC adaptor and charge the battery.
If you have a fully charged spare battery, turn off the
computer, replace the battery and turn the computer on
again.
When the computer enters hibernation with the battery
down and you resume the operation without charging
the battery, Windows may not start up normally or the
alarm function may not operate normally from then on.
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