If you look at the DC picture the battery just is lowered about 12". Instead of sitting on the tray, it sits inside the tray. Go to Step #8 in this link:
http://www.comptechusa.com/store/med...-SCKit2005.pdf
It is a supercharger kit for a 04+ TL but it gives you an idea of what the Password battery location will be like in terms of battery placement. You see how the battery now hugs the chassis instead of sitting on a tray above the chassis?