Need thoughts on battery operated sawsall

I got Cuda_ragtops Dewalt 20V XL drill and impact driver too, That little impact guy will torque down to 155 ft/lbs! Makes 14 bolt stainless splice cases a breeze to open as well as harvesting parts off motors. The Drill will take your wrist out as a nut driver, we cant even order them anymore in 20V! wouldnt bother with heavy Ni-Mh batteries anymore, small Li-io is where its at. I think I saw a Dewalt 80V battery pack that somehow adapts its voltage to whatever tool its in.