What is the harm in driving with a gutted out catalytic converter, its a shell. on 1995 Dodge Ram 1500

I the truck stopped on me on the freeway at a high rate of speed, I later found that the converter was clugged, I had it cleaned out and now it runs good. But now starting it up it slowly drags as if battery is down or starter is going out. But I dont no which one. How can I test this before buying something new.

Asked by for the 1995 Dodge Ram 1500
the catt that is hollwow is bad as vehicle needs the back pressure and high temp exh to control fuel system. have cahrging system ck 1st if ok then have starter ck'd