Originally Posted by coralman
I can't remember who makes the diehard but its not johnson. There is another company that makes an identical looking battery down to the aux battery post. I got the marine version platinum that had them also.
I believe it Enersys, same people who make the Odyssey's
We quit using the Optimas for racing and moved to the Odyssey's
a couple of years ago... I run them in my boats and jet ski as well.
Still have some of the older Optimas around and working well even at 7 years
old. (pre Johnsons). The Johnsons just don't seem to last like the originals.