The iPhone8Plus supports fast charging technology. Still available is the A1443 5V\/1A power adapter. Apple12W and 10WUSB power adapters can be used to charge ipads, iphones, iPods, Apple Watches, and other Apple accessories, and Apple12W or 10WUSB power adapters can be used to charge certain Apple devices and accessories. Charging speed is faster than 5W power adapter.
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Apple 8plus supports fast charging, but you need to use a dedicated fast charging device to achieve fast charging, with the original USB-C charger to achieve fast charging, charging speed up to 7.5W.
Apple 8 plus can be used for fast charging, although the charging head of the original phone is not very fast, but you can use the additional 18-watt expansion head or 10-watt expansion head purchased by Apple's official website for fast charging to use