iPhone 15 could have fast charging up to 35W. With the transition to USB-C, iPhone 15s will offer fast charging up to 35W. The 9to5Mac site affirms it, explaining that this peculiarity has been reported to them by sources in the sector, and that if not all, at least on some models, the possibility of fast charging with power supply up to 35W should be offered.
iPhone 15, the components reveal USB-C with Thunderbolt speeds
iPhone 14s currently offer fast charging with chargers up to 27W, and the Pro models can charge faster. You need an Apple USB-C to Lightning cable and a 20W or higher Apple USB-C Power Adapter to fast charge iPhone 12 and later.
For 35W charging of the iPhone 15, you could take advantage of the 30W or higher power supplies of the MacBook Air or the 35W dual port USB-C power supply.
Rumors of iPhone 15 with support for 35W maximum fast charging are not new and previously even the analyst Ming-Chi Kuo had reported this news thanks to the integration of the USB-C connector, and USB-C chargers and cables certified by Apple with the MFi logo. It cannot be ruled out that fast charging with 35W support is reserved for iPhone Pros. We remind you that thanks to USB Power Delivery, iPhone 8 or later can be recharged from 0 to 50% in 30 minutes; however, charging times vary depending on environmental factors (it may also not work in too cold or too hot conditions).