Batteries can do some crazy things to modern cars that depend on a very steady voltage. The speedometer in my S-10 used to warn me when my battery was going south. If the speedometer started bouncing around it meant that I'd better park somewhere good because I was not going to get it to start up again. Corrosion on the terminals of my 944 used to cause complete electrical failure. I'd be cruising down the highway at night and the entire car, headlights, taillights, dash light, engine would all go black. I'd have to coast to a stop then it would fire right back up and work fine for a few more days.
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