Chris Green wrote:

> Both 2A and 3A are well beyond the USB specifications, a 'perfect' USB
> lead may not be capable of carrying those currents.

You are mixing up things

2A/3A are provided by the chargers (well at least in the recent years).
What you refer as "beyond" is for the basic standard able to provide the
current.

https://en.wikipedia.org/wiki/USB

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