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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.
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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.
Apple xs can not use 20w fast charge
Apple xs only supports 18w fast charge; Apple xs is a mobile phone product released by Apple on September 13, 2018 at the Steve Jobs Theater in the United States. The model is equipped with the A12 Bionic chip, built-in lithium-ion rechargeable battery, and comes in silver, deep space gray and gold
Apple xs mobile phones do not support 20w fast charge, only support 18w fast charge, but it can use a 20W charger, but the charging power can only reach 18W.
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The iPhone XS Max features a 6.5-inch display with a resolution of 2688× 1242,458 ppi. The iPhone XS Max has more screen space than the \"Plus\" phones. The iPhone XS Max display supports landscape orientation for two columns of apps.
The xs can be charged with 20w fast.
Apple xs mobile phones do not support 20w fast charge, only support 18w fast charge, but it can use a 20W charger, but the charging power can only reach 18W.