I’ve read about impact wrenches, and learned that battery operated devices can extract more power because you can get higher voltages from the batteries. Since they’re not limited to 120V at the socket, you can get much higher power ratings.A few years back @Trav advised me on a cordless impact that was not too big for general automotive use; this thing is a game changer. Shortly after I rolled my compressor into the back shed... Highly recommended. Dang thing nearly does the dishes...
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I was shocked that batteries are a definitive advantage for peak torque ratings. I just hope that 450ft/lbs will be all I’ll ever need! Mine is corded!