Panasonic CF-W4 Series Reference Manual page 32

Battery Power
Confirm the Battery Indicator (When the power is off or in standby/hibernation mode)
You can view the remaining battery capacity using the following procedure.
Close the display and confirm that the latch is locked.
A
Disconnect the AC adaptor.
B
Slide the power switch (A) and confirm the battery indicator (B).
C
Battery Indicator (B)
Red
Blinking Orange
Orange
Blinking Green
Green
Remaining Battery Capacity
0 % - 4 %
5 % - 19 %
20 % - 49 %
50 % - 94 %
95 % - 100 %
32