I have this old battery operated wall clock in my garage that has been sitting flat on a shelf for years not, not in use, with battery an AA battery that has not been replaced for years. I just went into my garage and I heard a ticking sound. To my amazement the clock had started to work. I took out the battery and put it back in but it didn't start again. The battery has one of those tester strips on the side. It shows it has 0 power. I tried the battery in another clock. Nothing. Perhaps someone had put a newish battery in the clock? but there were no finger prints on it (it's very dusty). So what on earth is going on? Do I have a ghost, or something more rational?