I have an Optima Yellow Top -- I too tried to mount it in the correct upright position and couldn't get it to work without having to lengthen the cables.... To install it I had mount the battery on the side and bend the negative battery connection slightly (flatten) so you can hook it up safely in the rear.. I added terminal posts to the top of the side mount and use it for all my accessories.. works great at shows and whatnot cuz I can't start my car if I wanted to..
follow the pictures in my link if you wanna see it installed to make sense of what I am talking about..
page 2 of 5 I believe
