[LastMuel]

It seems a lot of people have missed this detail. Additionally, it looks like the battery pack has a usb-c/lightning port on it (possibly for charging while you keep using it).

It's visible in the following image: https://media.wired.com/photos/647e8a46e416fd283a85c2da/mast...

[Auracle]

MKBHD mentioned you could connect the battery pack to another another battery pack.

Making their own battery pack essentially a dongle instead of just having a USB-C adapter for their cable is so Apple it hurts.