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It works for Macbook to Macbook charging, so why wouldn't it work with the iPad?

Note that your device doesn't have to provide the requested power if it is unable to, it can provide less.

Doesn't the Macbook require a certain minimum power to be available before it will start trying to charge though. IE if I plug it into an old .5A USB charger would it try to charge off the 2.5W? That's most of what I meant when I was talking about providing enough power.

It charges quite happily off the 3W max which is standard on most non-power-delivery USB-C ports (inc Apple's, iirc)

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