Overview

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.

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

SR: Silver Oxide Battery

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

LR: LR Button Battery

  • -Toys
  • -LED lights
  • -Crime prevention buzzers
  • -Medical thermometers

Specifications

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

[Use]
Digital Watch
pdf
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
LR44 1.5 110 100 11.6 5.4 1.8 LR Button Battery
LR43 75 4.2 1.5
LR1130 45 3.05 1.2
LR1120 55 2.05 0.9
LR41 25 70 7.9 3.6 0.6

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

-Data and dimensions are not guaranteed. For further details, please contact us at your nearest Maxell office.

-Contents on this website are subject to change without notice.

Construction (SR: Silver Oxide Battery)

Principle and reaction

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
Battery reactions (LR Button Battery)
Total reaction : 2MnO2+Zn+H2O → 2MnOOH+ZnO

Safety precautions

If misused, this battery may deform, leak (the liquid inside the battery may leak to the outside), generate heat, explode, or ignite.
Since such misuse may cause injury or equipment failure, please be sure to read and observe [Warnings and Cautions].

Q922:
[Glossary of Battery Terms] : Internal short circuit
Q921:
[Glossary of Battery Terms] : Short circuit current
Q920:
[Glossary of Battery Terms] : Leakage resistance
Q919:
[Glossary of Battery Terms] : Utilization factor
Q918:
[Glossary of Battery Terms] : Electrolyte
Q928:
[Glossary of Battery Terms] : Active material
Q927:
[Glossary of Battery Terms] : Expiry date
Q926:
[Glossary of Battery Terms] : Aging
Q925:
[Glossary of Battery Terms] : Test after storage
Q924:
[Glossary of Battery Terms] : Storage
Q923:
[Glossary of Battery Terms] : Initial test
Q917:
[Glossary of Battery Terms] : Energy Density
Q916:
[Glossary of Battery Terms] : Capacity
Q915:
[Glossary of Battery Terms] : Duration time (Duration period)
Q914:
[Glossary of Battery Terms] : Polarization
Q913:
[Glossary of Battery Terms] : Charge
Q912:
[Glossary of Battery Terms] : Discharge characteristics (Discharge curve)
Q911:
[Glossary of Battery Terms] : Self discharge
Q910:
[Glossary of Battery Terms] : Over discharge
Q909:
[Glossary of Battery Terms] : Discharge
Q908:
[Glossary of Battery Terms] : Internal resistance
Q907:
[Glossary of Battery Terms] : End-point voltage (End voltage, Cutoff voltage, Final voltage)
Q906:
[Glossary of Battery Terms] : Load
Q905:
[Glossary of Battery Terms] : Nominal voltage
Q904:
[Glossary of Battery Terms] : Closed circuit voltage (CCV)
Q903:
[Glossary of Battery Terms] : Open circuit voltage (OCV)
Q902:
[Glossary of Battery Terms] : Rechargeable battery (Secondary battery)
Q901:
[Glossary of Battery Terms] : Primary battery

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