Panasonic Toughbook CF-C1ADAAZ6M Reference Manual page 38

Battery Power
NOTE
Once the battery is fully charged, the computer performs recharging only when the remaining battery power becomes
less than approximately 95% (75% when the battery's Economy Mode (ECO) is enabled), so overcharging is avoided.
Checking the Remaining Battery Power
There are three methods to check the remaining battery power.
To check the remaining battery power on the screen
(After logging on to Windows)
1
Press +
Fn
<CF-C1 Series>
Display
Left icon: Battery pack 1
Right icon: Battery pack 2
.
F9
Condition
When the battery pack is inserted. (example)
When the battery pack is not inserted.
When the battery's Economy Mode (ECO) is enabled,
When the battery pack is discharged. (AC adaptor is disconnected.)
The discharging battery is indicated in yellow.
38
is displayed.