https://www.theverge.com/circuitbreaker/2018/9/13/17855550/hyper-qi-airpods-adapter-wireless-charging

It might not come with a wireless charger, but Hyper’s Q wireless charging adapter — the HyperJuice Wireless Charger — can make your AirPods compatible with any standard 5W Qi charger. It doesn’t come cheap: it’s being sold by Hyper for $50. But it adds functionality that Apple is long overdue on providing.

Using the HyperJuice Wireless Charger is a straightforward process: you insert the adapter into the Lightning port of your AirPods case, then place it on your Qi wireless charger. That’s it. According to the HyperJuice’s spec sheet, it can charge AirPods to 100 percent capacity in 1.5 hours.