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Introduction
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As soon as we got the latest iPhone 13 Pro Max, we have done tons of charging tests on it, and please feel free to choose the part you're interested in.
ChargerLAB found that the peak charging power of the latest iPhone 13 Pro Max has reached 27W. So for this model, a 30W charger will be a good choice.

Up to 27W | Charging Compatibility Test of Apple iPhone 13 Pro Max (20W-100W)-Chargerlab