This depends a lot on how much you want to be spending.
I've used a Hitachi 1/2 impact gun in the past and found it to be reasonably powerful and with a decent battery life and it had already had a hard life by the time I started using it. Unfortunately I can't remember what the battery voltage was.
Our forklift engineers can normally park close to air supply ,can u not use air tools ?....i'll stop short of suggesting buying a compressor and air guns lol
Hi I bought one of those sealey ones years ago when I was working as a mechanic. It matched the snap on one that a colleague had and some 9 years later it has outlasted it too.
Used the sealey one for less than 12 months and it died, then went to a Hitachi 18v lion a superb gun small and light. It could just do with some more torque just 220 nm. Zip the local Ag Eng swears by snap on 440 NM. All the erectors I know use dewalt 18v 440NM. I'm looking at the dewalt 36v 440NM for site work even though its not my favorite make.
Well I've got the snap on 18v mother and it's mint. Battery life is long and its a powerful gun. My mate as got the IR one and it's not a patch on the snap on on. Also a friend as the sealy one the battery life seems poor