@forteller indeed! Although in this case it's a charging cradle for a waterproof watch, so I have some sympathy. A little USB port with a cover would get gross fast, this uses the metal case as negative and a small surface contact as positive.
It'd be good if some smart watch charging standard existed though.
@forteller I guess on the plus side I got to reuse an otherwise worthless proprietary charging cable (original iPhone from my friend's box of cables) to charge something else!
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