this post was submitted on 24 Sep 2023
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USB-A to USB-C limits charging power to 12W. The iPhone 15 accepts up to 27W from supported USB-C to USB-C cables and chargers.
Wired says 20 watts: https://www.wired.com/story/apple-iphone-15-usb-c/
In any case, my point is that USB-A still works and you don't have to immediately replace anything.
Wired (and others) report that 20W number because I think they're misinterpreting the Apple fast charging documentation, which explains that fast charging is available with a 20W charger or above. They've explained this for all the previous USB-PD compliant models, but real world testing has shown actual charging rates of up to 30W for the iPhone 14 Pro. I imagine the 15 and the 15 Pro will show similar numbers at the high 20's, maybe even 30 watts.