Ideal for watches, the Sony Murata 315 battery is a mercury-free silver oxide battery. It is guaranteed for 3 years from the month of packaging. Nominal capacity: 23mAh. Diameter: 7.9mm Height: 1.65mm Weight: 0.33gr

The Sony 319 battery is a so-called "green" battery, it is mercury-free silver oxide for the preservation of our environment. It is found in watches, game controllers, calculators etc? Nominal capacity: 22.5 mAh Diameter: 5.8 mm Height: 2.7 mm Weight: 0.29 gr.