The iPhone X supports fast charging.
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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.
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update
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iPhone X is a new model released by Apple (Apple Inc.) at 1:00 am Beijing time on September 13, 2017, at the Steve Jobs Theater at the new headquarters of Apple Park. The \"X\" is the Roman numeral for \"10\" and represents Apple's tribute to the 10th anniversary of the iPhone.
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Apple's official website clearly states that they support the fast charge function, which can be charged up to 50% of the power in 30 minutes.
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This fast charging speed is not as abnormal as the flagship Android phone (especially considering the difference in battery capacity), but it is a great improvement for iPhone users.