It's a 98 with around 103,000 on it, and the stock alternator, as far as I know.
What makes me think it's a good battery is that it didn't slowly die or dim or anything. I parked the car, it was fine (except for the ABS light), but then I turned off the ignition and tried to start it again, and nothing at all-not even a peep.
I did some searching since I posted (I know, I know, it should be the other way around), and I got a bunch of hits that talked about some mega-fuse.