I Use Rual King batterys in all my 6 volt cars 2 Model "A"s and 39 Chevy. I put maintainers on them in the winter good for 5 years , got up to 6 years on 1 battery., after 5 years I just replace them, paid $49.00 plus tax . Did have a problem w/1 but got an exchange within the 1st year. Best priced I could find! The battery i bought is a CT 1-3 625 CCA.
The neg post on one side and the Pos is on the other side.