Newport - May I inquire on the need for a second battery -- needwise ? If the alt is not providing enough juice for your components when they are on, then I would rethink your layout and setup.

FWIW, I fitted a Odysseey PC1700MJT into the stock location as it was almost due for a change - at the 5 year mark but at that time, I was undergoing a full false floor amp install so it was the last time I ever wanted to be down in that hatch area again.