Take the 5w slow charge of the Apple 5V1A and compare it to the latest 20w fast charge. What is the difference in charging speed? First of all, according to the actual measurement, this year's iPhone13 series uses fast charging, and the full time is about 1 and a half hours. The previous 5w slow charge, basically takes 3 hours to fill. That's a pretty big speed gap.
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Fast charging, of course, has an impact on the mobile phone battery, and it is very obvious that the fast charging battery is healthy and fast. This is also a big reason why Apple has been limiting the charging power. Battery loss too fast, or even damage, will cause an increase in after-sales rights issues, hardware reputation will also have a negative impact on the stock price, which is what Apple does not want to see. So holding too much caution, Apple has not been on the really competitive fast charge.
The Apple fast charge takes 40 minutes to fully charge, and the slow charge takes 2 hours