Panasonic Toughbook CF-H1CSLFZ6M Reference Manual page 31

Battery Power
Computer behavior with low battery
The default settings are as follows.
This computer automatically switches from Battery 1 to Battery 2 and vice versa when either remaining battery change
becomes less than 10%. When both batteries are not sufficiently charged, the computer operates as below.
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, close the application and turn off
the computer, 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]
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, replace the
battery and turn the computer on again.
Do not resume from hibernation until the battery is
charged or replaced.
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