I was at my father and son shop Tuesday and saw them take they're Milwaukee brand 20 volt mini compressor out to air up 4 tires on a tandem axle trailer they had sold. None of the tires were flat but all needed about 20 lbs of air. They punched in the desired pressure on the digital screen and when that pressure was reached it stopped automatically. It took about two minutes for each tire and is a pretty impressive little compressor. There are many different brands from about $40 to well over $200 for the Milwaukee with battery and charger. Quite handy and pricey for sure, but I'm wondering if anyone here has any experience with these little battery powered compressors.