Well, you are correct!! I don't have an auxiliary battery behind the seat which I was almost 100% certain that it must be there - I bought the battery before removing the phantom one which I thought I had. I should have attach a picture of my face to this post when I lift up the carpet under the sub-woofers.

However, I'm certain there must be an auxiliary battery somewhere in the car because the temperature and time lights on the instrument cluster blink every 15 seconds after I disconnected the battery. I guess I will pull the fuse to prevent battery drain until I figure this one out.