No vomit on my bike, please.....!
Chad above recommended a maintenance-free (sealed) battery.
Here's (partly) why.
A regular battery (i.e., with several caps for adding water) will sometimes burp up its some of its liquid contents, spilling acidic fluids beneath.
So you want to do a visual inspection on the electricals and the frame below the seat, and look for signs of this kind of spill. You'll see a rust pattern in the shape/direction that fluid would normally run anyway, or maybe a white powdery/chalky residue under the battery somewhere.
Also, look for signs of corrosion/acid damage on the electricals/wiring under the battery (in the area of the regulator/rectifier).
A real spill like this can spell trouble for you later on.
Before learning about what a great find the VN750 is, I once walked away from an otherwise very nice used Honda Shadow for the above reason.
If you don't see signs of this sort, install a maintenance-free battery when you get a bike, if it doesn't already have one.
Last edited by theauhawk; 07-03-2007 at 10:49 AM.