Are cordless tire inflators powerful enough for car tires?

For topping off passenger-car tires to highway pressure (typically 30–40 PSI), the consensus across reviewers we read is yes. Multiple r/Dewalt threads and r/VEDC discussions report cordless 20V-class inflators getting four car tires up to pressure on a single 4–5Ah battery. They are not a substitute for a tank compressor if you need to run pneumatic tools or seat truck tire beads.