Renata Batteries come from a Swiss company that is owned by the Swatch Group, which produces Omega, Longines, and Breguet watches. This is the brand which is trusted by thousands of watch repairers worldwide. This brand is a little more expensive and often used in quartz watches because the batteries are considered long lasting and reliable. The company makes 40 different types of Renata batteries that are constructed of silver oxide without any mercury. In the past, watch batteries contained a little mercury, but most companies have moved away from this chemical since it is toxic to the environment. Renata batteries provide about 1.55 volts and have a very low self-discharge rate; they are also leak proof. These button cell batteries are used in Swiss quartz watches such as Rolex, Tag Heuer, and Breitling.