Micro Battery

  • Advantages
  • Applications
  • Principle of Silver Oxide Battery
  • Cross Section


Silver oxide battery is a small-sized primary battery mainly used for wrist watches, using zinc as the negative electrode (cathode), silver oxide as the positive electrode (anode) plus an alkaline electrolyte . Thanks to its high energy density and superb stable discharge characteristics, silver oxide batteries are being used in a broad range of applications, from quarts watches to portable devices such as electric clinical thermometers and portable games.


list_mark High energy density
High energy density has been achieved owing to the Sony's original high-precision material-mixing technology. The use of antioxidant, high performance separators also contributes to improved storage characteristics.
list_mark Excellent stable discharge characteristics
Constant voltage output is available during the discharging.
list_mark Excellent leakage resistance
Sony-unique sealing structure, coupled with special sealing- material treatment, has helped accomplish the excellent leakage resistance.
list_mark A comprehensive product line-up
A comprehensive range of ultra-compact batteries is available to meet various needs.


  • list_mark Electric watches/clocks
  • list_mark Portable radios
  • list_mark Calculators
  • list_mark Camera
  • list_mark Electronic clinical thermometers
  • list_mark Remote controllers
  • list_mark Portable games

Principle of Silver Oxide Battery

Silver oxide (Ag2O) is used for the active cathode material, and Specially processed fine zinc-alloy powder is used for the active anode material. Potassium hydroxide is used for high drain type silver oxide battery as a electrolyte, and sodium hydroxide is used for low drain type.

Battery discharge reactions are follows

With open circuit voltage of approx. 1.55V, the battery voltage is extremely stable and impedance remains low during discharge.

Discharge Characteristics after Storage for Silver Oxide Batteries for Watches/Clocks based SR521SW

  • list_mark 60°C 20-days and 60°C 40-days storage conditions are equivalent to 1 years and 2 years, respectively, at room temperature.
  • list_mark Excellent long-term reliability
  • list_mark After storage, decrease in discharge time is minima1.
Discharge Characteristics after Storage for Silver Oxide Batteries for Watches/Clocks based SR521SW

*For other model's characteristics,please consult our sales representative.

Cross Section


Primary Battery
  • Coin Manganese Dioxide Lithium Batteries
  • Silver Oxide Batteries


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  • Button Type Alkaline manganese Batteries