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Views: 0 Author: Site Editor Publish Time: 2026-11-03 Origin: Site
A coin cell battery, also known as a button cell battery, is a small, round, disc-shaped battery designed to provide reliable power for compact electronic devices. Its compact size, lightweight structure, and relatively stable voltage make it an ideal power source for products with limited installation space and low power consumption.
Coin cell batteries are widely used in everyday electronics and industrial applications, including watches, calculators, remote controls, car key fobs, medical devices, fitness trackers, electronic toys, sensors, and IoT products.
Depending on their chemical composition, coin cells offer different voltage levels, discharge characteristics, operating temperatures, and service lives. Choosing the right chemistry and model is essential to ensuring product performance, reliability, and cost efficiency.
Coin cell batteries are available in several chemistries. Each type has distinct electrical characteristics and is designed for different application requirements.
CR batteries are non-rechargeable lithium coin cells that use lithium as the anode and manganese dioxide as the cathode. They typically provide a nominal voltage of 3V.
Key features:
High energy density in a compact size.
Low self-discharge rate and long storage life.
Stable voltage output during most of the discharge cycle.
Wide operating temperature range, depending on the model.
Suitable for devices requiring long-term, maintenance-free power.
Typical applications:
CR coin cells are commonly used in car key fobs, computer motherboards, medical monitoring devices, electronic meters, wireless sensors, memory backup systems, and smart home products.
Popular models include CR2032, CR2025, CR2016, CR2450, and CR1632.
LR batteries are non-rechargeable alkaline button cells with a nominal voltage of 1.5V. They generally use zinc as the anode and manganese dioxide as the cathode.
Key features:
Affordable and economical for mass-market products.
Suitable for low-power electronic applications.
Widely available in different sizes.
Generally lower capacity and shorter service life than comparable lithium coin cells.
Typical applications:
LR button cells are commonly found in small toys, calculators, laser pointers, digital thermometers, remote controls, and other basic electronic devices.
Common models include LR44, LR41, LR43, and LR1130.
SR batteries are non-rechargeable silver oxide button cells with a nominal voltage of 1.55V. They use silver oxide as the cathode and zinc as the anode.
Key features:
Stable voltage throughout most of the discharge process.
High energy density compared with many alkaline button cells of similar dimensions.
Good performance in precision electronic devices.
Low self-discharge and reliable long-term operation.
Typical applications:
SR batteries are widely used in quartz watches, precision instruments, medical devices, calculators, and other electronics requiring consistent voltage.
Popular models include SR626SW, SR621SW, SR920SW, and SR927SW.
Rechargeable coin cells provide an alternative for electronic products designed for repeated charging.
Different rechargeable chemistries offer different voltage characteristics and charging requirements.
Series |
Chemistry |
Nominal Voltage |
Main Features |
|---|---|---|---|
LIR |
Lithium-ion |
3.6–3.7V |
Rechargeable, relatively high energy density |
ML |
Lithium manganese |
3.0V |
Rechargeable, suitable for low-power backup applications |
VL |
Lithium vanadium oxide |
3.0V |
Rechargeable, designed for specific low-power applications |
Note: Actual voltage specifications and performance vary by model and manufacturer.
Typical applications:
Rechargeable coin cells are used in backup power systems, real-time clocks (RTC), memory protection circuits, compact electronic devices, and certain wireless products.
Unlike primary CR, LR, and SR batteries, rechargeable coin cells require compatible charging circuits and must be operated within the manufacturer's specified charging limits.
Understanding coin cell model numbers helps engineers and buyers identify battery dimensions and select compatible products.
Most common lithium coin cell models use a four-digit numerical code following the chemistry prefix.
The first two digits represent the approximate diameter in millimeters, while the last two digits represent the nominal thickness in tenths of a millimeter.
For example:
CR2032
CR: Lithium manganese dioxide chemistry.
20: Approximately 20 mm in diameter.
32: Approximately 3.2 mm in thickness.
Nominal voltage: 3V.
Other common examples include:
Model |
Diameter |
Thickness |
Chemistry |
|---|---|---|---|
CR2016 |
20 mm |
1.6 mm |
Lithium |
CR2025 |
20 mm |
2.5 mm |
Lithium |
CR2032 |
20 mm |
3.2 mm |
Lithium |
CR2450 |
24.5 mm |
5.0 mm |
Lithium |
CR1632 |
16 mm |
3.2 mm |
Lithium |
It is important to note that the model-number convention is not universal across all button cell chemistries. Alkaline and silver oxide batteries may follow different naming conventions.
Before selecting a replacement, always verify the actual dimensions, voltage, terminal configuration, and electrical specifications against the original battery.
Choosing the correct coin cell battery requires more than matching its physical dimensions. Engineers and product designers should evaluate several important electrical and environmental parameters.
Different battery chemistries have different nominal voltages. For example, CR batteries typically provide 3V, while LR batteries provide 1.5V and SR batteries provide 1.55V.
Check the operating voltage requirements of the electronic device, including its minimum operating voltage and voltage tolerance.
Using an incompatible battery may result in unstable operation, reduced performance, or potential damage to the electronic circuit.
Battery capacity, usually measured in milliampere-hours (mAh), indicates how much electrical charge a battery can deliver under specified test conditions.
However, actual battery life also depends on discharge current, pulse requirements, operating temperature, and device power consumption.
For products such as wireless transmitters and smart sensors, engineers should pay particular attention to pulse discharge performance rather than relying solely on nominal capacity.
Temperature can significantly affect battery performance.
Low temperatures may reduce available capacity and increase internal resistance, while high temperatures can accelerate self-discharge and battery aging.
For outdoor sensors, automotive electronics, and industrial equipment, select a battery with an operating temperature range suitable for the actual application environment.
For products that remain in storage before use, shelf life is an important selection factor.
Lithium coin cells generally offer low self-discharge and long storage life, making them suitable for applications requiring extended standby periods.
Buyers should also consider storage conditions, manufacturing dates, packaging quality, and the manufacturer's recommended storage temperature.
Although coin cell batteries are small, they require proper handling, storage, and disposal.
Prevent accidental ingestion: Coin cells can cause severe internal chemical burns if swallowed, particularly lithium button cells. Keep all button and coin batteries out of the reach of children. Seek immediate emergency medical attention if ingestion is suspected, even if no symptoms are present.
Avoid short circuits: Do not allow battery terminals to come into contact with metal objects, keys, or other conductive materials. Short circuits can cause overheating and leakage.
Do not recharge primary batteries: CR, LR, and SR batteries are designed for single use. Attempting to recharge them may cause leakage, overheating, or rupture.
Observe polarity: Install batteries according to the positive (+) and negative (-) markings indicated by the device manufacturer.
Store properly: Keep batteries in their original packaging in a cool, dry environment. Avoid exposure to direct sunlight, excessive heat, and moisture.
Recycle responsibly: Do not dispose of used batteries with ordinary household waste. Follow local battery collection and recycling regulations to ensure environmentally responsible disposal.
Selecting the right coin cell battery is essential for ensuring the performance, reliability, and service life of your electronic products. Whether you are developing a new device, sourcing components for an existing product, or purchasing batteries for large-scale manufacturing, choosing an experienced battery supplier can make a significant difference.
At Naccon, we specialize in battery manufacturing and supply, offering a wide range of battery solutions for consumer electronics, industrial equipment, medical devices, smart products, and other applications.
Our coin cell battery portfolio includes popular CR lithium, LR alkaline, and other button battery models to meet different voltage, capacity, dimensional, and application requirements.
We support overseas customers with:
Multiple battery options: A range of coin cell models for different applications.
Quality assurance: Professional manufacturing and quality control processes.
Sample support: Samples available for product testing and compatibility evaluation.
Bulk order support: Flexible communication on order quantities, specifications, and packaging requirements.
OEM solutions: Custom branding and packaging options, subject to project requirements.
If you are looking for a reliable coin cell battery supplier, our team is ready to help you identify suitable products for your application.
Contact Naccon today to request product specifications, discuss your battery requirements, or inquire about samples and bulk orders. We look forward to supporting your business with dependable battery solutions.
