The iPhone11 can determine whether the phone has entered a fast charge according to the speed of charging.
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If there is an ammeter, you can also try to connect the ammeter test to see the charging power, the charging power of different devices is slightly different, usually between 13.5 and 18W, and is related to the remaining power of the device.
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The iPhone11 supports 18w fast charge, but the phone is not equipped with an 18w fast charge plug and needs to be purchased separately. iPhone11 built-in lithium-ion rechargeable battery, battery capacity of 3110mAh, support wireless charging.