My z2 arrived this afternoon. Although I've not had a chance to actually build anything useful, I have been able to test the pins to see if my VERY simple charger (which consists of me physically holding wires up to charging pins) works.
So to confirm to anyone interested, the top pin is positive with the bottom pin ground. Attached is a - distorted - image showing what I mean. Hopefully someone will find it useful for their own projects.
I'll keep this thread updated with any further designs I come up with for the charger.
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