When I Remove the battery from the laptop, the proper icon shows that tthere is no battery but when I put it back, nothing happens.
The widget's popup still says "Battery : Not present" but the battery is there.
If I remove the cable, It says no no battery and no AC adapter, which is quite weird.

Each time I remove the battery, plasma-desktop says :

file:///usr/share/apps/plasma/plasmoids/battery/contents/ui/batterymonitor.qml:175: TypeError: Result of expression 'pmSource.data["Battery0"]' [undefined] is not an object.
file:///usr/share/apps/plasma/plasmoids/battery/contents/ui/batterymonitor.qml:174: TypeError: Result of expression 'pmSource.data["Battery0"]' [undefined] is not an object.
file:///usr/share/apps/plasma/plasmoids/battery/contents/ui/batterymonitor.qml:53: TypeError: Result of expression 'pmSource.data["Battery0"]' [undefined] is not an object.
file:///usr/share/apps/plasma/plasmoids/battery/contents/ui/batterymonitor.qml:52: TypeError: Result of expression 'pmSource.data["Battery0"]' [undefined] is not an object.

I'm not a qml expert so I don't really understand what's happening (There are no messages when I plug it back in).

upower properly detect the plugging and unplugging.