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Apple does not provide a power adapter for the MagSafe charger, requiring users to bring their own USB-C power adapter. Apple sells a new 20W power adapter that, as it turns out, seems to be the only one currently capable of providing full 15W charging power for the new MagSafe charger.
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YouTube channel Zollotech tested several first - and third-party power adapters with the iPhone 12 Pro and MagSafe chargers, using meters to measure actual power output. With the Apple-supplied 20W power adapter, the MagSafe charger managed to achieve 15W of power, but none of the other chargers he tested offered the same speed.
Yes. magsafe Wireless Charger with 18w charging head:
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First, use Apple 18W PD charger with Apple MagSafe magnetic wireless charger to charge iPhone 13 Pro Max, the charger output 9V voltage, power 9.42W.
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Replace the Apple 18W PD charger with an Apple 20W PD charger, and the output power of the charger is 8.93V 1.84A 16.53W.
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Use the Apple 30W PD charger to charge the iPhone 13 Pro Max at 8.90V 1.40A 12.53W.