What do you do with the black cord that comes with the oculus two headset? One part of the court is already attached to the headset. I bought Bobovr 2 With the extra battery and a charging station for the whole thing. I still do not know what to do with the black cord? Does it get plugged into the battery? Also should I leave it charge day and night until I use it and put it back in the charger or do I need to shut it off?