Arctis 7 Charing ??? wat?

[VGlead98]

So i just bought this SteelSeries Arctis 7 , i am doing my first charing
i see of the app it display charging full (4 bar ) but i unplug it it is back to 2 bar,
so how to check if its really full or what?
Please Help

 

[gasaraki]

Leave it plugged in till it stops charging itself.

 

[VGlead98]

can i charge it using wall plug?
will it auto disconnect the power after fully charge?