https://wccftech.com/iphone-2019-models-bigger-batteries-reverse-wireless-charging/

Reverse wireless charging is a feature that debuted with the launch of the Mate 20 Pro last year, followed by the Galaxy S10 lineup. Thanks to its poor wattage output on the Mate 20 Pro, a lot of critics labeled it as a gimmick rather than a useful feature and pointed out that it would be beneficial when just topping up your wireless accessories such as Qi-enabled earphones, and that was pretty much it. For the 2019 iPhone lineup, one popular analyst believes that upcoming iPhone models will harbor bigger batteries and will also support 2-way wireless charging.

According to Ming-Chi Kuo via MacRumors, in a report sent out to investors, 2-way wireless charging is coming for the iPhone 2019 lineup. This will let the Qi-supported iPhone models wirelessly charge another iPhone or the new AirPods with the Wireless Charging Case.