Quoting RedTwo:
My SLA battery is laying down in the stock location, with the air intake on top of it. All more or less in the stock locations /ubbthreads/images/graemlins/dunno.gif
I'm considering doing this. I have a gvr4zum battery tray but I'm debating on that, the trunk or what you said. Probably one of the latter two, because the gvr4zum tray (while a very nice, quality piece) is a lot of weight right over the wheels.