find a powerbank that does 12v on the usb output (they're out there) and it'll run forever.
You can get usb c PD to barrel jack cables at the voltage of your choice which helps with this kind of thing.
https://shop.pimoroni.com/products/usb-type-c-3-1-pd-to-5-5mm-barrel-jack-cable-1-2m-long-with-e-mark?variant=40092918022227
@aggi started
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find a powerbank that does 12v on the usb output (they're out there) and it'll run forever.