Inserted the plug into my Power armor Mk4, standing near the power station outlet, station has electricity, registers my approach, sparks fly out, then just a little sparking continues, and when I go into my suit, the plug has no electricity. Since I have huge battery pack in the armour, it isn't easy to tell if its charging from looking at the battery status, and by the decrease of sparking I'd say it charged just for a moment... Yet my batteries are not full...
EDIT:
Well, after my suit charged, the suit plug now has electricity. Not sure if I was taxing the suit too much there...