influential
The iphone xs charging with 20w fast charger is harmful to the phone. It has an effect on the battery. Charging a phone with a fast charge will heat up, and the fast charge will more or less affect the battery life of the phone.
Because Apple's fast charge is the standard USB PD protocol, that is, the use of high voltage, low current way to charge the iPhone, charging process voltage can reach 9V.
No damage to the battery.
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At present, the mainstream Apple mobile phones (such as iPhone11 series, iPhone EXs series) support PD fast charge, if the brand (such as purple rice) power adapter in the standard and voltage standards are in line with the requirements of Apple mobile phone, then generally speaking, it will not cause harm to the Apple mobile phone battery.
However, it should be reminded that the original data cable can not be matched with 20W charging head
To fast charge the iPhone Exs, in addition to a 20W fast charge head, you also need
C to L data cable