Milwaukee claims that the 2603-22ct, which comes with the 2.0 batteries, has 650 in-lbs of torque. The 2603-22, same drill but comes with the XC 4.0 batteries, has 725 in-lbs of torque. Milwaukee claims the impacts get the same power with either battery.
I'm an electrician and I have the Milwaukee folding jab saw. I use it for drywall just about exclusively. I use these blades in it:
Greenlee jab saw blades