You mean there's a reason they make you tie the battery down?

I still have fond memories of welding some craptacular battery tie down out of random scraps of metal at 3 AM the morning before an autocross school. So much fun racing on 2 hours sleep. And then on my new car, the first time I removed the tie down (right before an autocross of course) it turned out that it was rusted into oblivion and I had to come up with something quick for the autocross the next day, and that's why I have a corroded battery strap from an 88 Jeep on my car.