Maxell SR Series Silver Oxide Battery

The button-type silver oxide battery uses silver oxide (Ag2O) as its positive active material and zinc (Zn) as its negative active material. Potassium hydroxide (KOH) (W-type) or sodium hydroxide (NaOH) (SW-type) is used as an electrolyte.

Description

Button-type silver oxide batteries are characterized by high-energy per unit volume and stable operating voltage. As a result, they are used as a power source for applications such as quartz watches, and in recent years their use has expanded to medical devices and BLE devices.

Maxell is the first company in Japan to successfully market button-type silver oxide batteries and has many years of experience and know-how. Also, in consideration of the environment, all products are designed to use zero mercury. For more information, please contact Maxell.

The button-type silver oxide battery uses silver oxide (Ag2O) as its positive active material and zinc (Zn) as its negative active material. Potassium hydroxide (KOH) (W-type) or sodium hydroxide (NaOH) (SW-type) is used as an electrolyte.

Battery reactions (Silver Oxide Battery)
Positive reaction : Ag2O+H2O+2e- → 2Ag+2OH-
Negative reaction : Zn+2OH- → ZnO+H2O+2e-
Total reaction : Ag2O+Zn → 2Ag+ZnO

Brand

Maxell

Maxell

Maxell was formed in 1960, when a dry cell manufacturing plant was created at the company's headquarters in Ibaraki, Osaka. In 1961, Maxell Electric Industrial Company, Limited was created out of the dry battery and magnetic tape divisions of Nitto Electric Industrial Company, Limited (now Nitto Denko Corporation).

On March 18, 2014, the company was listed on the First Section of the Tokyo Stock Exchange. In 2013, Maxell, Ltd. acquired Hitachi Consumer Electronics, Co., Ltd.’s projector design, development and manufacturing assets and resources. On October 1, 2019, Maxell Corporation of America announced it would assume responsibility for all operations related to both Hitachi- brand and Maxell-brand projector products and accessories in the North American market.

Features

  • Features (SR: Silver Oxide Battery)
  • Stable discharge characteristics
    A discharge curve during discharge supplies a stable voltage until the end of the discharge life.
  • High-energy density
    A silver oxide battery’s high-energy density per unit volume provides approx. twice the amount of energy capacity as button-type alkaline batteries.
  • Excellent discharge load characteristics
    Alkaline electrolyte is used to provide excellent discharge load characteristics. Depending on the composition of the electrolyte, two models are available; a low-drain type (SW type) for analog watches and a high-drain type (W type) for multi-function watches (which incorporate an alarm and a light), medical equipment, etc.
  • Superior leakage* resistance
    Featuring Maxell’s original leak-resistant processing, the SR battery has excellent leakage resistance, which suppresses the electrolyte from rising up and seeping out — a basic phenomenon of alkaline electrolytes.
    (* Leakage is defined as an unintended escape of liquid from a battery.)
  • Taking environment in consideration
    As one of its measures to reduce the environmental impact, Maxell draws upon its original technology to realize longer-lasting, superior leakage-resistant characteristics without using mercury and lead.

Applications

  • Analog watches
  • Digital watches
  • Measuring instruments
  • Calculators
  • Medical instruments
  • BLE devices

Specifications

Model Nominal
Voltage
(V)
Nominal
Capacity
(mAh)*
Nominal
Discharge
Current
(µA)
Diameter
(mm)
Height
(mm)
Weight
(g)
for Use
SR44W 1.55 165 200 11.6 5.4 2.2 High drain type

[Use] Digital Watch
SR43W 1.55 125 200 11.6 4.2 1.8
SR1130W 1.55 79 100 11.6 3.05 1.2
SR1120W 1.55 55 100 11.6 2.05 1.0
SR936W 1.55 75 100 9.5 3.6 1.1
SR927W 1.55 60 100 9.5 2.73 0.8
57
SR920W 1.55 39 100 9.5 2.05 0.6
SR41W 1.55 39 50 7.9 3.6 0.7
SR726W 1.55 28 50 7.9 2.6 0.5
SR721W 1.55 25 50 7.9 2.15 0.5
SR626W 1.55 28 50 6.8 2.6 0.4
SR621W 1.55 18 50 6.8 2.15 0.3
SR44SW 1.55 165 200 11.6 5.4 2.2 Low drain type
Long life[Use] Analog Watch
Thermometer
SR43SW 1.55 125 100 11.6 4.2 1.7
SR1136SW 1.55 100 100 11.6 3.6 1.6
SR1130SW 1.55 83 100 11.6 3.05 1.2
SR1120SW 1.55 55 100 11.6 2.05 1.0
SR1116SW 1.55 29 50 11.6 1.65 0.7
SR936SW 1.55 71 100 9.5 3.6 1.1
SR927SW 1.55 55 100 9.5 2.73 0.8
50
SR920SW 1.55 45 50 9.5 2.05 0.7
35 0.6
SR916SW 1.55 26.5 50 9.5 1.65 0.5
SR914SW 1.55 22 35 9.5 1.45 0.45
SR41SW 1.55 45 50 7.9 3.6 0.7
SR731SW 1.55 36 50 7.9 3.1 0.7
SR726SW 1.55 33 50 7.9 2.6 0.5
SR721SW 1.55 25 30 7.9 2.1 0.5
SR716SW 1.55 23 30 7.9 1.68 0.3
SR712SW 1.55 10 20 7.9 1.29 0.25
SR626SW 1.55 30 30 6.8 2.6 0.4
27
SR621SW 1.55 23 30 6.8 2.15 0.3
18
SR616SW 1.55 16 20 6.8 1.65 0.3
15
SR527SW 1.55 17 30 5.8 2.7 0.3
SR521SW 1.55 16 20 5.8 2.15 0.2
13
SR516SW 1.55 12.5 20 5.8 1.65 0.2
SR512SW 1.55 5.5 5 5.8 1.25 0.14
SR421SW 1.55 12 20 4.8 2.15 0.17
SR416SW 1.55 8.3 10 4.8 1.65 0.12
SR44 1.55 165 200 11.6 5.4 2.2 General use
SR43 1.55 125 100 11.6 4.2 1.8
SR1130 1.55 79 100 11.6 3.05 1.2
SR1120 1.55 55 100 11.6 2.05 1.0
SR41 1.55 39 50 7.9 3.6 0.7

* Nominal capacity indicates the duration until the voltage drops to 1.2V when discharged at a nominal discharge current at 20 deg. C.

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