Big enough alligator clips and you hook to a 12v battery. Either for fast charging of the mod or a jump start for the vehicle.
I guess it makes a bit of sense, if using it to build on. Even though most people can build on their standard 510 it might be a bit of a pia since it means standing it up and risking knocking it over. The 510 ohm reader on the side means the mod can lay flat without risk of tipping it, bumping it etc and having it crash land.
Who knows, turning everything into a swiss army tool is always the rage. Oh look, it's a corkscrew, a flashlight and a cat litter scoop! For those times you want to sneak in during the night to clean the cat crap out of the box then pop some wine to celebrate.