Inflators are a trouble product, its hard to make a good one cheap due to the heat generated in doing any serious inflating. I have the Craftsman C3 and had an issue where each trip to the dealer the car came back with all four tires at 28 psi instead of 35 that I prefer. By the 4th tire the nose was too hot to touch and the hose ready to fall out of the attachment point.
Here is the rub, make the inflator part of a system with a robust battery and people will try to pump up too many or too much in one go and its going to get hot and/or fail. Make a larger, reliable inflator, with a price to match and you sell very few vs existing units that are corded and run off the car battery.