According to “leaker” Max Weinbach of the EverythingApplePro YouTube channel, the wireless charging coil on the back of iPhone 13s may be larger than that of previous models.
Reverse Charging iPhone for AirPods and Apple Watch
Enough to improve heat dissipation and charging power, but also perhaps offer a function still unknown on Apple laptops: Reverse Charging, which is the possibility of 'use your iPhone as a wireless charger for other devices like AirPods or Apple Watch.
Reverse Charging also on the iPad 2022?
Such a feature was already rumored in 2019, but nothing has materialized since. For good reason, wireless reverse charging quickly drains the battery and would for the moment have more place on a more powerful device like the iPad. In this regard, recent rumors see this feature coming to the iPad 2022.