@cas I think I was unclear. My suggestion was to power a dock without an O2+ to see if it draws current. I suspect it will. If I had one we'd already know the answer, but I don't have one.
Of course my suggestion doesn't get you any closer to a solution, it was just to confirm a theory that could play into your solution.
Ah, yes, I did misunderstand.
It's an easy enough test.
The result is that the charger doctor shows no current draw at all with a mini-dock connected and no O2+ installed in it. Flipping the switch on shows 0.00A so if it is drawing anything, it is below the 10mA threshold of the charger doctor's display.
This is definitely different to the draw with an O2+ installed and 'powered off'.
Is it possible that an electrical circuit is not even being created unless an O2 is actually installed?