Electronic/Quartz Breitling Watches
This will qualify that the watch is running well and also it is good service. No one likes to buy a watch and have to replace the battery after a short period!
Certain eletcronic tuning fork watches like the early Bulova Accutron require batteries that are now obsolete.
Always check that a replacement battery is available even if it is not the same calibre number. Definitely get a couple of spares.