Comprehensive Guide to Button Batteries: Types, Sizes, and Applications

Button batteries, also known as coin cell batteries, are compact power sources widely used in electronic devices such as watches, hearing aids, and remote controls. Their small size and reliable energy output make them indispensable in modern technology. Classified based on their chemistry and dimensions, these batteries follow a standardized naming system, ensuring compatibility across various applications. Common types include alkaline (LR), lithium (CR), silver oxide (SR), and zinc-air (ZA), each offering unique advantages in voltage stability, lifespan, and environmental impact. Understanding their specifications is crucial for selecting the right battery for specific electronic needs.

Catalog

What is a Button Battery

Button batteries, commonly known as coin cell batteries, provide compact energy for a wide array of electronic devices. These small powerhouses are found in everything from watches and calculators to hearing aids and certain complex medical devices, reflecting their role in the ever-evolving landscape of technology.

Characteristics, Naming, and Chemistry of Batteries

The classification of button batteries relies on a precise naming system that directly relates to their chemical makeup and physical dimensions. This naming convention adds a layer of understanding to these seemingly simple energy sources:

- A letter at the start indicates chemical composition: "L" for alkaline, "A" for silver oxide, and "SR" for durable silver oxide variants.

- The following numbers denote the battery's diameter in millimeters. For example, in the label "SR44," the "44" signifies a diameter of 11.6mm.

- Subsequent numbers reflect the thickness; in the "SR44" case, this suggests a height of 5.4mm.

- Silver oxide batteries typically deliver a voltage of 1.55V.

Some identifiers differentiate batteries with similar dimensions but distinct shapes or features. Consider "CR2032," where "20" confirms a 20mm diameter and "32" indicates a 3.2mm height, generally with a voltage of 3V. Although largely standardized, this identification system can vary, and checking packaging or datasheets remains wise to ensure correct specifications.

Button Battery Dimensions

Understanding the dimensions of button batteries is crucial when selecting the right battery type for specific applications. These batteries' dimensions are defined by their diameter and thickness, offering a range of sizes and voltages. Here, we provide a comprehensive overview of common button battery sizes, their specifications, and examples.

LR Button Battery (Alkaline Coin Cell)

- LR43 (AG12): Features a diameter of 11.6mm and a height of 4.2mm, operating at 1.5V. Ideally suited for medical instruments and electronic playthings.

- LR41 (AG3): Measures 7.9mm in diameter and stands 3.6mm high, consistently providing 1.5V.

- LR44 (AG13): With a diameter of 11.6mm and a height of 5.4mm, it delivers 1.5V, frequently seen in children's toys and portable electronics.

- LR54 (AG10): Exhibits a diameter of 11.6mm and a height of 3.1mm, maintaining 1.5V, popular in toys, calculators, and laser devices.

- LR59 (AG2): Measures 7.9mm in diameter, 2.15mm in height, offering 1.5V, favored for small toys and gadgets.

- LR66 (AG4): Has a diameter of 6.8mm, height of 2.6mm, delivering 1.5V, and fits into timepieces, calculators, and medical devices.

- LR626 (AG4): Matches the LR66 in size and voltage, suitable for watches and thermometers.

- LR1120 (AG8): With dimensions of 11.6mm by 2.1mm, it provides 1.5V, used in calculators and clocks.

Alkaline LR button batteries power a broad spectrum of small electronic devices, such as watches and calculators, esteemed for their affordability and accessibility. They operate well at standard temperatures and minimize leakage risks. Yet, their lower energy density might mean shorter life in high-demand scenarios, and cold weather can impair their function. Disposal poses environmental risks due to their chemical makeup, and recycling opportunities may not be universal.

The "AG" numbers often found in consumer markets reflect the LR series, with AG1 equating to LR60 and AG13 to LR44, despite not being an official designation.

CR Button Battery (Lithium Coin Cell)

- CR927: Measuring 9.5mm by 2.7mm and operating at 3V, suitable for LED lights and electronic ornaments.

- CR1025: With dimensions of 10mm by 2.5mm, offers 3V, utilized in compact devices.

- CR1225: Size of 12.5mm by 2.5mm, at 3V, supports memory backup and small electronics.

- CR1620: Diameter of 16mm, height of 2.0mm, at 3V, commonly found in car keys and gadgets.

- CR1632: At 16mm by 3.2mm, provides 3V, used in car fobs and small electronics.

- CR2016: Diameter of 20mm, height of 1.6mm, 3V, typically power remote controllers and medical tools.

- CR2025: Measures 20mm by 2.5mm, 3V, supporting electronic gaming and gadgets.

- CR2330: With dimensions of 23mm by 3.0mm, delivers 3V, used in some automotive and medical tools.

- CR2032: A favorite lithium cell at 20mm by 3.2mm, 3V, common in calculators and remote controls.

- CR2450: Diameter of 24mm, height of 5.0mm, at 3V, supports larger devices needing longevity.

- CR3032: At 30mm by 3.2mm, provides 3V for large devices demanding compact, high-capacity power.

Lithium CR button batteries are preferred for applications requiring compact and durable power, celebrated for high energy density and extended shelf life. They work well over diverse temperature ranges, beneficial for outdoor use. However, costs are higher compared to alkaline, and safety risks from leakage exist. Disposal challenges remain, even with less-toxic materials compared to other types.

SR Button Battery (Silver Oxide Coin Cell)

- SR416SW (337): Measures 4.8mm by 1.6mm, supplying 1.55V, for compact devices like hearing aids.

- SR516SW (317): Dimensions of 5.8mm by 1.6mm, at 1.55V, fits small electronics and wearables.

- SR626SW (377): With a diameter of 6.8mm and height of 2.6mm, often found in watches.

- SR621SW (364): Same diameter, with a height of 2.1mm, primarily also used in watches.

- SR721 (362): At 7.9mm by 2.1mm, supplies 1.55V, suitable for watches and instruments.

- SR927SW (395/399): Measures 9.5mm by 2.7mm, 1.55V, frequently used in high-end watches.

Silver oxide SR batteries offer consistent voltage, enhancing reliability in precision devices like watches and medical tools. Their higher energy density means reduced battery changes. However, the higher costs due to silver content may deter those with budget constraints, and environmental sustainability remains a challenge due to silver extraction.

Zinc Air Button Battery

- ZA675 (Blue Tab): Diameter of 11.6mm, height of 5.4mm, 1.4V, mainly for hearing aids due to high density and longevity.

- ZA312 (Brown Tab): At 7.9mm by 3.6mm, operating 1.4V, another popular hearing aid size.

- PR70 (312 Hearing Aid Battery): Measures 7.9mm by 3.6mm, at 1.4V, specifically for hearing aids, balancing size and power.

- PR48 (13 Hearing Aid Battery): Measures 7.9mm by 5.4mm, at 1.4V, used in hearing aids for longer life from larger size.

Zinc-air batteries leverage oxygen for power, resulting in high energy density, ideal for hard-to-replace battery applications like hearing aids. Environmentally, fewer toxic materials are needed. Performance depends on environmental factors like humidity and air; once activated, they discharge continually, reducing practicality for infrequent use. Zinc sourcing and processing still inflict environmental impact.