The MuRata SR616SW silver oxide battery is suited for powering low-drain electronic devices, such as a watch or a clock. This non-rechargeable coin cell offers a 16mAh capacity for long-lasting power on which you can rely. The MuRata SR616SW, also known as size 321, measures just 6.8 mm in diameter and 1.65 mm in length; though small in size, this micro battery is sure to keep your watch powered and working. This silver oxide cell is sold individually in tear strip packaging. When purchasing in higher quantities, the size 321 battery will be packaged in tear strips of five.