Varta high-quality silver battery. It is much more durable than an alkaline battery and therefore more willingly used by professionals in small electronic devices. Silver batteries differ from alkaline batteries in a higher voltage level (1.55V compared to 1.5V in alkaline batteries) and the structure of the battery itself: in silver batteries, the cathode is made of silver oxide, and zinc anode. In alkaline batteries, the cathode is made of manganese dioxide and the anode is made of zinc oxide. In the case of both types of batteries, the electrolyte is potassium hydroxide. Silver batteries are more durable than alkaline batteries, which is why they are often used in devices such as watches, calculators, meters and other electronic devices. They have the highest capacity-to-weight ratio. Technical Specifications: Type: 303 Diameter: 11.6 mm Height: 5.4 mm Weight: 2.3 g Electrochemical System: Silver Battery Voltage: 1.55 V