I would recommend the Optima 6v also. I am using one in my Model T since it is not used very often. One nice thing about them is if you are getting creative about where to mount your battery, the Optima can rest sideways or any way you wish.
I would like to know from the earlier posters if they use one of those electronic battery maintainers such as the Battery Tender brand with theirs. Mine will not work. It stays in the full charge mode all the time.
