The Optima fits back there, but it is a little bit taller than the standard battery. Watch out for the positive terminal if you go that route!

You can attach a small 12v battery under the hood whilst changing out the main battery. Use the +12V connector intended for jump starting and any handy spot for ground. By doing this you keep your radio presets, radio code, window and sunroof auto-close programming, engine management parameters, etc. Less painful than reprogramming it all, especially if any of the aforementioned stuff is Greek to you.

- JimY