Overview

Maxell is the first company in Japan to successfully market button-type silver oxide batteries. Based on many years of experience and know-how in various fields, the SR battery is suitable for precision electronic devices such as quartz watches, where high-energy density per unit volume and a stable operating voltage are required. Various product lineups are available to meet the growing need for supplying power to various types of watches, ranging from large to compact, thin models. Zero-mercury, zero-lead added types are also available. For more information, please contact Maxell.

Features

Flat discharge characteristics A flat discharge curve during discharge supplies a stable voltage until the end of the discharge life.

High-energy density High-energy density per unit volume provides approx. twice as the amount of energy capacity as button-type alkaline batteries.

Excellent discharge load characteristics Employing an alkaline electrolyte, the SR battery features excellent discharge load characteristics. Depending on the composition of the electrolytes, two models are available;
(1) a low-drain type for analog watches, and
(2) a high-drain type for multi-function watches incorporating an alarm, illumination light, 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.

Construction

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
Positive reaction : Ag2O+H2O+2e- → 2Ag+2OH-
Negative reaction : Zn+2OH- → ZnO+H2O+2e-
Total reaction : Ag2O+Zn → 2Ag+ZnO

Applications

  • -Calculators
  • -Film Cameras
  • -Watches
  • -Medical Instruments, Cash Registers
  • -FA Instruments (Measuring Instruments, Onboard Microcomputers, Sensors)

Specifications

Model Nominal
Voltage
(V)
Nominal
Capacity
(mAh)*
Nominal
Discharge
Current
(µA)
Diameter
(mm)
Height
(mm)
Weight
(g)
High drain type
SR44W 1.55 165 200 11.6 5.4 2.2
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
Low drain type
SR44SW 1.55 165 200 11.6 5.4 2.2
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
39 0.6
35
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
22
SR712SW 1.55 10 20 7.9 1.29 0.25
SR626SW 1.55 30 30 6.8 2.6 0.4
28
26
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
General type
SR44 1.55 165 200 11.6 5.4 2.2
SR43 1.55 125 200 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
4SR44 6.2 160 200 13 25.2 11.7

* 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.

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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