muRata INNOVATOR IN ELECTRONICS

Micro Batteries
for Watches

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An image of Murata Watch Battery with High Reliability & Technical Performance

Murata Watch Battery
with High Reliability
& Technical Performance

World's first mercury-free silver watch battery innovator, highly recognized as No. 1 market share manufacturer by major watch brands

Product Lineup
Murata Watch Battery Features Packaging Design Video on Murata's Micro Battery Business

Murata Watch Battery Features

Silver Oxide (SR) Battery with High Reliability & Technical Performance

Development of
the world's first mercury-free
silver oxide battery in 2004

An image of Development of the world's first mercury-free silver oxide battery in 2004

Historically, mercury has been used in button batteries to reduce hydrogen gas generated inside the battery because the elimination of mercury was considered technically impossible. Murata undertook the challenge of designing mercury-free silver oxide batteries to contribute to the protection of the environment and consumers. Murata successfully introduced the world's first mercury-free silver oxide batteries in 2004 and went on to develop a mercury-free alkaline manganese button battery in 2009.

Unique manufacturing process
for strong anti-leakage performance

An image of Unique manufacturing process for strong anti-leakage performance

Murata's button batteries have superior anti-leakage performance thanks to its unique sealing material and technology. Our patented "J-shaped gasket" was invented as a unique sealing solution to maintain air pressure inside the battery. Optimization of the gasket shape results in the reduction of leakage risks during long-term storage.

Cumulative production
total of over 10 billion units

An image of Cumulative production total of over 10 billion units

In 1977, Murata started its production of button batteries. We have achieved a cumulative production total of over 10 billion units during the period 1977 to 2017. Murata continues to focus our R&D efforts towards developing battery solutions which protect the environment while exceeding customer expectations for reliability and performance.

Product Lineup

Silver oxide batteries
(SR, 1.55V)

Product Lineup

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Thickness Type Diameter
4.8mm
(0.189inch)
5.8mm
(0.228inch)
6.8mm
(0.268inch)
7.9mm
(0.311inch)
9.5mm
(0.374inch)
11.6mm
(0.457inch)
1.0mm
(0.039inch)
1.2mm
(0.049inch)
Low Drain
(NaOH)
SR512SW
(6mAh)
SR712SW
(9.5mAh)
1.4mm
(0.057inch)
Low Drain
(NaOH)
SR714SW
(15mAh)
1.6mm
(0.065inch)
Low Drain
(NaOH)
SR416SW
(8.3mAh)
SR516SW
(11.5mAh)
SR616SW
(16mAh)
SR716SW
(23mAh)
SR916SW
(30mAh)
High Drain
(KOH)
SR1116
(30mAh)
2.0mm
(0.081inch)
2.1mm
(0.083inch)
Low Drain
(NaOH)
SR421SW
(12.5mAh)
SR521SW
(16mAh)
SR621SW
(18mAh)
SR721SW
(25mAh)
SR920SW
(35mAh)
High Drain
(KOH)
SR621W
(20mAh)
SR721W
(29mAh)
SR920W
(40mAh)
SR1120
(60mAh)
2.6mm
(0.102inch)
2.7mm
(0.106inch)
Low Drain
(NaOH)
SR527SW
(22.5mAh)
SR626SW
(26mAh)
SR726SW
(35mAh)
High Drain
(KOH)
SR626W
(28mAh)
SR726W
(35mAh)
SR927
(52mAh)
3.0mm
(0.120inch)
3.1mm
(0.122inch)
Low Drain
(NaOH)
SR731SW
(39mAh)
High Drain
(KOH)
SR1130
(85mAh)
3.6mm
(0.142inch)
Low Drain
(NaOH)
SR936SW
(70mAh)
High Drain
(KOH)
SR41
(45mAh)
SR936W
(75mAh)
4.2mm
(0.165inch)
High Drain
(KOH)
SR43
(110mAh)
5.4mm
(0.213inch)
High Drain
(KOH)
SR48
(75mAh)
SR44
(160mAh)
Reference materials

Alkaline Manganese Batteries
(LR, 1.5V)

Superior economic efficiency
Positive electrode uses a comparatively inexpensive manganese dioxide for superior cost performance.
Superior discharge stability
and heavy load pulse characteristics
Provides a stable discharge voltage even during momentary discharge of large currents.
Superior leakage resistance
Achieves superior leakage resistance
through Murata's unique sealant processing and sealing technology.
Product Lineup
Thickness Diameter
7.9mm
(0.311inch)
11.6mm
(0.457inch)
2.0mm
(0.081inch)
2.1mm
(0.083inch)
LR1120
(45mAh)
3.0mm
(0.120inch)
3.1mm
(0.122inch)
LR1130
(70mAh)
3.6mm
(0.142inch)
LR41
(45mAh)
4.2mm
(0.165inch)
LR43
(110mAh)
5.4mm
(0.213inch)
LR44
(120mAh)
Reference materials

Coin Manganese Dioxide Lithium Batteries
(CR, 3V)

Superior storage characteristics
Features extremely low self-discharging through the careful selection of stable materials for the active material and electrolytic solution and our custom sealing technology. The amount of self-discharge at room temperature and normal humidity is less than 1% of the nominal capacity per year.
Superior leakage resistance
Demonstrates superior leakage resistance over the long-term through the adoption of our custom battery structure and electrolytic solution.
UL-certified components
Murata's coin-type manganese dioxide lithium batteries are UL-certified components.
(UL1642 File No. MH12566)
Product Lineup

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Thickness Diameter
12mm
(0.492inch)
16mm
(0.63inch)
20mm
(0.787inch)
24mm
(0.965inch)
1.6mm
(0.063inch)
CR1216
(30mAh)
CR1616
(60mAh)
CR2016
(90mAh)
2.0mm
(0.079inch)
CR1220
(40mAh)
CR1620
(80mAh)
2.5mm
(0.098inch)
CR2025
(160mAh)
3.0mm
(0.118inch)
CR2430
(300mAh)
3.2mm
(0.126inch)
CR1632
(140mAh)
CR2032
(220mAh)
5.0mm
(0.197inch)
CR2450
(610mAh)
Reference materials

Packaging Design

5-pieces Blister Pack
An image of 5-pieces Blister Pack
10-pieces Box
An image of 10-pieces Box
Product Leaflet

Video on Murata's Micro Battery Business

Murata offers a wide range of micro batteries with high performance and reliability,
taking advantage of 40+ years technology development and manufacturing expertize

Send your inquiry

Murata Manufacturing

Head Office
10-1, Higashikotari 1-chome, Nagaokakyo-shi, Kyoto 617-8555
Common Stock
69,444 million yen (as of March 31, 2019)
Local code
6981
Stock Exchange Listings
In Japan: Tokyo Overseas: Singapore
Sales Amount
Consolidated basis: 1,575,026 million yen (as of March 31, 2019)
Number of Employees
Consolidated basis: 77,571 (as of March 31, 2019)