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Why don't smart watches use USB-C to recharge?
(shkspr.mobi)
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Because the port and the associated internal hardware would take up a huge amount of space.
It's not much space to a smartphone, but to a device the size of a watch, the USB-C port would end up being the largest internal component.
Wireless charging is the answer for most watches, though it means cases can't be all metal and glass.