How long does a watch battery last?
The life span of a watch battery depends on the age and quality of the watch, as well as its functions and how often those functions are used.
In most cases, a battery in a brand new quartz watch with basic time and date functionality may last up to four years. As the watch ages, the mechanism becomes worn and drains more power (the reason why factory-installed batteries last longer). Typically replacement batteries last between one and two years. It is possible for a battery to last longer, but it is recommended to replace the battery every year to avoid potential leakage.
Watches with functions such as lights, alarms, and chronographs drain more power, and the more these functions are used, the faster the battery will drain. Due to the high power consumption of such functions, some watches may also be equipped with more than one battery.