I agree that torque is the problem. But I'm not so sure that the short lever of any drill, corded or otherwise, is going to give you enough leverage. Nothing like pulling the trigger and finding you aren't strong enough to hold the drill, which could do the job if only you could hold on to it.
I looked at the DW245 @theoldwizard1 referenced and couldn't find any torque specs on it. It is a 1/2" drill, but corded. I have a Rigid 1/2" drill (Home Depot house brand, I think) that produces around 450 inch-pounds of torque, and have found it capable of twisting itself right out of my hands. I'm not sure it could do what the OP wants because, after all, it only provides the standard 6 inch or so lever arm almost all drills have.