Phone Charger Voltage Question

If I understand correctly, the "cell phone enforcement" team, put a limit of 5 volts per usb port.

With some companies getting away with 5.1 volts.

My questions are:

A: Is that just a written code or do the usb ports have a govenor on them so to speak.

B: If a charger claims to have over 5 volts, is that a lie or is it really more voltage?




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