I replaced the battery (at a local jewelry store) in an old, beloved Swatch, but it kept losing time. Like, minutes on the hour. I was at the UW Children's Hospital and figured I'd get an expert watch-person's opinion of the problem with my watch.
Turns out, it wasn't the battery (I was hoping it was, I love that watch) but an older watch whose part had just worn down. The woman working at Dykman's hooked my watch up to some machine that tested its ... ticker? Pulse? She was sympathetic but also very sure that the watch was the problem.
While I was waiting I browsed the watches a little bit. They have some really beautiful ones for sale.