NGL, pretty big fan of these ! can charge AirPods on their own, reverse wirelessly charge, manage charging % to run down the internal battery and occasionally juice the external interchangeably and manage thermals, and if you have a newer USB-c iPhone it extends lighting charging functionality.
..I'm really surprised they didn't just replace the lightning version when they discontinued it in the fall last year
I dont $99 love it, that strikes me as overpriced (what Apple accessory isn't sadly) but it's still pretty great and gets crapped on a lot unfairly. Much more versatile than the previous smart battery silicone cases they released for prior models.