Bought on Monday. Charged via 20W iPhone charger; this seemed to work initially. But since then, it simply won't charge at all. Tried different leads, all work elsewhere. Tried spare battery, so probs not that. Nikon manual says that a charger of 27W/9v/3A should be used; is this true? My Z6 charges off any old thing. And the fact it initially charged up suggests there might be a problem with the camera. Anyone else got any insight into this? I'm wondering if there's a simple fix before I take it back to the shop. Very annoying I have to say.
EDIT: If you didn't try already (you weren't specific in this) please try to charge your Z6 again with the same cable and charger and get back to us. If that works, then it's probably a camera issue. If not, then you may have your answer.
We need to try to rule out that it's not the charger and the cable, so by trying with your Z6, that will pretty much tell us what the issue is (or at least if it's the camera or the cable/charger).
Also to verify, are you using OEM batteries? If not, that could also cause it not to charge, although most third party batteries (if not all) CANNOT be charged in the camera that I'm aware of. But only the OEM batteries can. I believe the camera can tell if an OEM battery is used, but I'm sure some third party mfrs are trying to work around that.
So if you aren't using OEM batteries or you're using an older version of the battery that maybe went bad, that could damage the charge circuits on the camera and could be one possibility (although unlikely). But doing the test I recommended with your Z6 will tell us more.