We have a cordless Dewalt 3/8 electric impact. It is awesome. It is so handy, you don't have to run hoses everywhere. I think ours was 6 years old before we rebuild the batteries and for 2 of them it was like 90 bucks. Not an extreme amount. We went with a 3/8th because it can go up to 1/2 sockets with an adapter and still have enough power to get the job done.