I replaced my "new" alternator with another and the VR just in case (and grounded it real well with a bolt through the firewall backed with a good, tight nut) and everything works well now.
I took careful measurements, and looked at the specs of ALL their batteries, and the battery I used is the one I think works best with the oem type battery. It leaves some extra room, which is good, because it allows easy access to it and storage of the 15-18" cables that I used. I have a small drain on my battery when the car sits though (maybe the clock?), and I have noticed it drains down in a week or two if left untended, whereas the old battery took 3-4 weeks.
I just use the right battery tender and no issues.