After a long time ticking away on ‘display’, my Cosmotron X8 Chronomaster stopped. I changed the battery, installing a new and unused one. But the watch didn’t fire up, other than very briefly. So I was all ready to send it off for a check-up and service, but decided to try a different new battery – and guess what? Yep, it fired up and is now happily ticking away again. So lesson learned – a new battery may not be a good battery!