I had the problem with a cracked battery clamp on a different car.
It had the rubberized type of paint on it, so you couldnt see the crack.

The car would run fine if jumped, but wouldnt start.
What a nightmare that was. It died at a gas station and I was in my swimtrunks. Classy.

Last night I did the motor mounts, my next project is replace the center bearing.

So you all havent heard the last of me...