A new report from a Chinese news outlet suggests that the Xiaomi Mi Mix 4 will ship with a colossal 5,000mAh battery. It supports 120W fast charging over a cable and 80W wirelessly. However, one will very likely require a proprietary wireless charger to hit those speeds.
https://www.notebookcheck.net/The-Xiaomi-Mi-Mix-4-s-battery-could-support-80W-wireless-charging.547494.0.html