you can fit a large deep cycle (D34) battery in the back portion of the passenger side storage compartment. You woudl have to cut a hole in the cooler to allow a battery to fit, but it could be done, but not necc. I wouldn't do it.
FYI, I've been working on a stereo install on my 04 SSV for the last few months. I'll have pics up soon. I have two 6V golf cart batteries mounted in the storage area. It takes up space, but still leaves room for things to be placed on top.
(Message edited by acurtis_ttu on November 02, 2005)