Apparently, Oppo found a way to safely implement "air-charging" into smartphones using a new FreeVOOC coil and an electromagnetic emitter that has a 10-meter range. This allows the batteries to constantly charge at 5-10 W while in the range of said emitter, so the phone supposedly never runs out of juice.
https://www.notebookcheck.net/Oppo-Reno-Ace-Infinity-to-include-FreeVOOC-air-charging-tech-that-keeps-batteries-charged-forever.459650.0.html
In the description of that video it says that it's an april joke
I know, but that is not an official OPPO channel, just some Youtube uploader. The official video and comments are in the Weibo link I provided, and there is no word from Oppo regarding this being a hoax, for now. I'll update the article if it indeed turns out to be a joke.
Quote from: Jaroslav Teleňko on April 01, 2020, 17:15:52
In the description of that video it says that it's an april joke
Chinese speaker here. The Chinese text at the end of the video clearly states it's an April Fools joke.