Micro BatteriesSilver Oxide Batteries

Silver oxide batteries are small-sized primary batteries with high capacity and stable discharge characteristics. They are suitable for medical devices and precision instruments. All models are 100% made in Japan, and environmentally friendly (0% mercury).

Silver oxide batteries

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Selection Guide

Extensive product lineup from small & thin size to high capacity models
High Drain (New product)
Ideal for medical devices that require high current load characteristics
Type Standard High Drain
Operating temperature -10°C to 60°C -10°C to 60°C
Maximum pulse discharge current to maintain min.
1.2V at 100ms upon DOD 0% (23°C)
40mA 120mA


  • High energy density
    High energy density has been achieved owing to the Murata's original high-precision material-mixing technology. The use of antioxidant, high performance separators also contributes to improved storage characteristics.
  • Excellent stable discharge characteristics
    Constant voltage output is available during the discharging.
  • Excellent leakage resistance
    Murata-unique sealing structure, coupled with special sealing- material treatment, has helped accomplish the excellent leakage resistance.
  • RoHS directive・European Directives
    This product does not contain Mercury (Hg), Cadmium (Cd), nor Lead (Pb), and conforms to EC regulation values (Directive 2006/66/EC, 2013/56/EU). Battery pack are excluded from RoHS directive (DIRECTIVE 2011/65/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment).


  • Medical devices
  • IoT devices
  • Precision instruments

Series Lineup

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Part NumberStatus Nominal Capacity Diameter (inch) Diameter (mm) Height (inch) Height (mm) Mass (oz) Mass (g) Nominal Voltage Operating Temperature Range IEC (JIS)
60mAh 0.457inch 11.6mm 0.081inch 2.05mm 0.0325oz 0.92g 1.55V -10℃ to 60℃ SR55
85mAh 0.457inch 11.6mm 0.12inch 3.05mm 0.0494oz 1.4g 1.55V -10℃ to 60℃ SR54
45mAh 0.311inch 7.9mm 0.142inch 3.6mm 0.0229oz 0.65g 1.55V -10℃ to 60℃ SR41
110mAh 0.457inch 11.6mm 0.165inch 4.2mm 0.0635oz 1.8g 1.55V -10℃ to 60℃ SR43
75mAh 0.311inch 7.9mm 0.213inch 5.4mm 0.0423oz 1.2g 1.55V -10℃ to 60℃ SR48
20mAh 0.268inch 6.8mm 0.085inch 2.15mm 0.0113oz 0.32g 1.55V -10℃ to 60℃ SR60
28mAh 0.268inch 6.8mm 0.102inch 2.6mm 0.0141oz 0.4g 1.55V -10℃ to 60℃ SR66
29mAh 0.311inch 7.9mm 0.083inch 2.1mm 0.0148oz 0.42g 1.55V -10℃ to 60℃ SR58
35mAh 0.311inch 7.9mm 0.102inch 2.6mm 0.0176oz 0.49g 1.55V -10℃ to 60℃ SR59
40mAh 0.374inch 9.5mm 0.081inch 2.05mm 0.0208oz 0.59g 1.55V -10℃ to 60℃ SR69
60mAh 0.374inch 9.5mm 0.106inch 2.7mm 0.0275oz 0.78g 1.55V -10℃ to 60℃ SR57
45mAh 0.374inch 9.5mm 0.106inch 2.7mm 0.0247oz 0.70g 1.55V -10℃ to 60℃ SR57
150mAh 0.457inch 11.6mm 0.213inch 5.4mm 0.0776oz 2.2g 1.55V -10℃ to 60℃ SR44
75mAh 0.374inch 9.5mm 0.142inch 3.6mm 0.0388oz 1.1g 1.55V -10℃ to 60℃ SR45
  • *Data is not guaranteed, and is provided for reference purposes only.
  • *Please contact us for other models.

Discharge Characteristics vs. Temperature / Capacity

Discharge Characteristics vs. Temperature / Capacity (High Drain Type, W)

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 as an electrolyte.
Battery discharge reactions are follows

Principle of Silver Oxide Battery

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

Cross Section

Cross Section