> They now make a bluetop battery for sailboats.  the
> deep cycle version is the exact same as the yellowtop,
> but it has wing nut terminal fasteners instead of the
> typical studs.  The optima website is in transition to
> a new site and there is no info on it yet.

The pictures I have seen of the blue top optimas have both
studs and the wingnut fastners (4 posts total).

There's a pic at: http://www.optimabatteries.com/

and a better one with stats at:
        http://www.dcbattery.com/optima_blue.html

dave