The Apple 13 doesn't support reverse charging, so you can't reverse charge someone else. But you can charge the iPhone 13 with a phone that supports reverse charging. Take Huawei p50pro as an example:
Step 1: In the phone's Settings menu, tap the Battery option.
Step 2: Turn on the \"wireless reverse charging\" function, and put the Huawei phone and the Apple phone back to back together to charge.
iPhone13 can not charge other mobile phones, iPhone13 battery increased capacity, is a progress than before, and then there is a circular coil, can reduce the battery heat consumption, and wireless charging, but the current iPhone13 can not reverse charge, that is, can not charge other mobile phones. But this is possible in the future.