I found some interesting information out today. It may be common knowledge but I didn't see it in the first few pages of the search I did. When looking for a 6V battery for my tractor I sent my father to the Interstate dealer in Maumee, OH. Johnson Controls (plant is near the Toledo airport) makes Interstate batteries as well as Motorcraft. I bring this up because I've had extremely good experiences with the MC batteries. He did say that the specs are different between the two brands. Anyway there ya go. Do with it what you will.