https://techcrunch.com/2020/10/27/mophie-introduces-a-modular-wireless-charging-module/

Here’s a clever addition for Mophie, one of the longstanding battery case makers, which is now a part of the same smartphone accessory conglomerate as Zagg, Braven, iFrogz and InvisibleShield. The Juice Pack Connect is a modular take on the category, with a battery pack that slides on and off.

For $80 you get a 5,400mAh battery (that should get you plenty of additional charge time) and a ring stand that props the phone up. Mophie may offer additional models at some point, but right now, the biggest selling point is less about add-ons and more the fact that you can slip the battery off the device when not needed and still use the case.