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Well if you go by the spec then USB1 and USB2 can only deliver 0.5A. Apple seems to have settled as 2.1A as the most current you can run through a USB connector

Well if you go by the spec then USB1 and USB2 can only deliver 0.5A. Apple seems to have settled as 2.1A as the most current you can run through a USB connector without getting it too hot.

Dylan16807 11y ago
The power delivery spec requires special cables but allows 5 amps over normal* type A connectors. *except for a detection mechanism for higher-power cables