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Xiaomi uses a proprietary charging protocol, I believe it is called Hypercharge. It also requires a proprietary cable with an extra pin/chip.

Also, it's only for fast charging, you can use any other charger or wire without an issue.

You can charge it just fine with regular usb-c charger. So not a problem.

At very limited charging speeds though. That goes against the USB-PD mandate.

I haven't noticed that when I tried them out. It was still charging faster than the Pixel or iPhone.