I have a table where I do all my battery charging for all my equipment. I have two battery chargers and one charging hub for my P3P and Inspire 1. Is there any problem with leaving the chargers plugged into the wall outlet without having any batteries charging? Should I unplug the chargers when not in use? What about the HUB? I notice that when the hub in connected to the charger without a battery, it lights up the yellow light indicators so I have made it a practice to unplug the hub from the charger but leave the charger plugged in. Is this OKAY? An Electrical Engineer I am not. Those who are, please help.