The output of the (this and probably a lot of others) wireless charger is either 5V/1A or 9V/1.1A - therefore you cannot get anything higher than 5W with an iPad 12W charger which uses 5V. Only 9V/1.1A could go higher.
The adapter itself can output 5.2V/2.4A (~12W) or something...but the charger will accept input of 5V/2A and output 5V/1A=5W.
QC2.0, 3.0 adapters support both voltages.
P.S. Update - output of the charger is 5V/1A, input from adapter is 2A... why does the multimeter shows 1A where it is between the adapter and input to the charger - I don’t know
In any case, as I said, I believe on 5V can not result in output more than 5W on this charger.
...Hope I did not wrote a mistake
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As I understand it, iPad charger will not be able to do it. Somebody correct me if I made a mistake.
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Could you, please do some testing and tell how many % can Mophie charge per 10 minutes when battery is under 50%?