This page contains general hints about watch batteries.
Never leave a battery in a watch that has stopped, for more than about 12 months. If you do, you run the risk of the battery chemicals leaking out, when the cell gets completely depleted. This will corrode the battery contacts, and/or affect the watch dial. This can mean that when you DO decide to replace the battery, then watch will NOT WORK. DON’T LEAVE IT TOO LATE.