https://www.cnet.com/news/spigen-forever-sleeve-case-will-charge-your-phone-even-in-your-pocket-ossia-wireless-tech/

Spigen plans to release the case and the separate power transmitter in early 2020 or sooner, Ossia said -- months later than the 2018 timeframe the company had hoped for last year. Pricing isn't yet set.

Ossia's technology, called Cota, is young and not powerful enough to top off your laptop's bigger battery. But it and a competing wireless charging system from rival Energous show that beaming power through the air could keep your phone battery topped up even when it's in your pocket.