5mm
The Bulova watch model C969515 typically uses a SR927SW or 395/399 battery. These are button cell batteries with a diameter of 9.5mm and a thickness of 2.7mm. It is important to ensure you use the correct battery size to maintain the proper functioning of the watch.
The japan movement watch does require a battery. The battery in the watch will need changed frequently to keep the watch working properly.
The most important part of a watch is battery. With out a battery a watch is dead.
Try a battery tester
i got a watch for Christmas and it lasted about a year and a half with a cheap watch. Also a tip if you get a cheep watch and the battery dies just get a new watch cause replacing the battery can cost more that the watch did. :)
Keyword: watch batteryQuestion: How long does a average watch battery last? This is a very good question. The average watch battery can last at least a year or so but it all depends on the particular brand of watch you are using.
If the battery has round terminals the positive is the larger diameter of the two
A 371 watch battery
Maxell LR626 battery
Casio has a digital watch that claims 10 yrs of battery life.
The Nixon 51-30 watch is an automatic watch and does not need a battery.