I've noticed that every time I go through the security gate at the library of the hospital I work in, I hear a faint, high-pitched whine. I put two and two together quickly and realized it was the iPod that was responsible. I don't know how those gates work except I sort of figure that if the security device is magnetic, the gates are checking for a certain...polarity? Or something. I really don't know magnets. So assuming this is the case, I figure it must be the battery that causes that noise. I don't imagine there's any harm in this, really, but I just wanted to make sure--it's not going to do damage, is it?