The Apple x can be charged with 20w fast.
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However, it is worth noting that in order to achieve fast charging of the iphone x, you not only need a charging head that supports USB PD fast charging, but also a USB-C to Lightning data cable.
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iphonex charging method:
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The first: use Apple 29W USB PD fast charger charging, this method can help the iPhone X to reach enough power in a short time.
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The second: use Apple 5V\/2.4A charger to charge, this method is the most cost-effective way to charge.
Yes. The iPhone X supports fast charging. According to the data given by Apple's official press conference, the iPhoneX supports the PD fast charge protocol, which can reach a fast charge speed of 29W.