I watched a review on YouTube, a guy reinflated four 38" tires from 5 to 38 psi with one 4.0 amp/hour battery....not bad at all imo.How many batteries to fill a 37" tire?
Good luck with that. While my portable electric stuff has become more powerful, stamina, it has not. And those batteries loose half their charge when the temps drop. My electric impact eats a battery in just a few uses in the winter.