DeWalt 20V portable air compressor

I assume you mean their 60V version? It ought to be up to the task, and not take forever (though it won't be the fastest compressor around). It also isn't especially compact from what I can see.

My little Fini AirBoss is smaller and a little more powerful, though it's not battery powered, and does a perfectly fine job of keeping my motorhome's tires inflated; it's also less expensive than the DeWalt setup. Maybe it's something for you to consider.