Ridgid just came out with a cordless brushless air compressor, which can drive up to 1200 brad nails when powered by 2x 18V 5.0Ah Li-ion battery packs.
Review: Rolair JC10 Super Quiet Air Compressor
Rolair’s JC10 is indeed as super quiet as advertised, and there are a couple of other factors which has led this to become the best small-capacity portable air compressor I’ve seen.