Panasonic CF-Y2 Series Reference Manual page 36

Battery Power
Press Fn+F9 to Check the Remaining Battery Power on the Screen
(After logging on to Windows)
Check the Remaining Battery Power and Remaining Time using the Windows Battery
Meter
When the battery pack is inserted in the computer (example)
When the battery pack is not inserted in the computer
Display by selecting the
The remaining battery power and remaining time indicated are calculated based on the
computer's usage conditions at that time, so these displays may change when usage
conditions change. (These displays are only a guide.)
in the taskbar when the AC adaptor is not connected.
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