That happened in my 97SE. Battery terminal fell clean out of the battery, acid started leaking out. Happened under really *REALLY* bad circumstances too.
July 2002, I had a triple bypass at age 35 after getting chest pains while bicycling. Wife drives me home from the hospital in my Bonneville. We stop at Wallgreens to get my pain medication prescription filled, because my pain meds were gonna wear off in 30 minutes. She goes inside, 20 minutes later comes back with the prescription. Turns key, car won't start. We can't figure it out. Call a friend who brings jumper cables. Neither my wife, nor her friend know how to jump start a car. I get out, wearing a bathrobe, slippers, and holding a floppy-eared stuffed toy rabbit, with a freshly sewn up chest, and I jump start the damn car. We get home.
A day or two later I call a buddy over to help me figure out what'* wrong with my battery. We go look at it, touch the battery cable, and the entire positive terminal falls right off the battery, casing cracked in a complete circle around the battery terminal.
I got a new battery from Sears a day later, had my buddy help pull the battery, cleaned everything up with some baking soda and water, then installed the new battery. It also got brand new battery cables after that. Still going strong. (Both me and the battery.) The one time you really need to rely on your car. . .
97 SE, teflon wiper blades, Dunlop Sport A-2 tires, Leather steering wheel cover, Pioneer DEH-P480MP mp3 CDRW head unit, Pioneer 12-disc changer, iPod hookup, Boston Acoustic 3 way 6x9'*, Boston acoustic separates in door pods, Alpine 4 channel amp in trunk. Magnaflow dual outlet muffler and Ractive stainless tips. Autozone rice pipe and K&N 4750 intake kit. Clear corner lights. Energy Suspension end links.