A CR battery is a lithium coin cell commonly used in small electronics. Selecting the right CR battery size plays a crucial role in device performance and reliability. Many devices, such as watches, car remotes, and medical tools, require specific button battery models. The BCI Group Size system shows how standardized cr battery sizes and specifications prevent improper fitment and support reliable operation. Engineers rely on precise cr battery parameters like capacity and internal resistance to ensure each button battery delivers safe, consistent power. Understanding these factors helps users avoid compatibility issues and extend device lifespan.
Key Takeaways
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CR batteries are small lithium coin cells with a stable 3.0-volt output, used in devices like watches, remotes, and medical tools.
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The battery code (e.g., CR2032) shows its size: the first two digits mean diameter in millimeters, the last two mean thickness in tenths of a millimeter.
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Larger CR batteries hold more energy and last longer, but must fit the device to avoid damage or poor performance.
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Always choose the recommended CR battery size for your device to ensure safety, reliability, and longer battery life.
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Dispose of used CR batteries properly by recycling at approved locations to protect people and the environment.
CR Button Battery Basics
What Is a CR Battery?
A CR battery belongs to a family of lithium coin cells designed for small electronic devices. The "CR" prefix follows the International Electrotechnical Commission (IEC 60086) standard, which identifies lithium chemistry and a cylindrical shape. The numbers after "CR" indicate the battery’s size in millimeters. For example, a CR2032 battery measures 20 mm in diameter and 3.2 mm in thickness.
CR batteries use a lithium metal anode and a manganese dioxide cathode. This chemistry provides a stable nominal voltage of 3.0 volts, which sets them apart from alkaline button battery types that deliver only 1.5 volts. The typical capacity ranges from 270 to 290 mAh, depending on the model and manufacturer. These batteries offer high energy density, long shelf life, and reliable performance across a wide temperature range.
Note: The IEC and ANSI standards ensure that button battery sizes and specifications remain consistent worldwide. This standardization helps users select the correct cr button battery for their devices.
| Feature | Details |
|---|---|
| Physical Size | Diameter: 24.5 mm, Thickness: 3.0 mm (coin cell size) |
| Chemistry | Lithium metal anode, Manganese dioxide cathode, lithium salt electrolyte |
| Nominal Voltage | 3.0 volts (stable operating voltage) |
| End Voltage | 2.0 volts (battery considered empty) |
| Capacity | 270-290 mAh (varies by manufacturer and conditions) |
| Discharge Current | Typical: 0.2-0.3 mA; Pulse: up to 15 mA |
| Advantages | High energy density, long shelf life, wide temperature range, good pulse capability, safety and stability |
| Typical Applications | Watches, calculators, medical devices (glucometers), fitness devices (heart rate monitors) |
| Safety Considerations | Risk of choking, chemical burns, fire/explosion if mishandled; requires proper storage and handling |
Common Uses for Button Batteries
Button batteries power a wide range of compact electronics. Their small size and high energy density make them ideal for devices that require long-lasting, reliable power. The most common applications include hearing aids, games, toys, watches, calculators, and small light sources. Remote controls, key chains, and clocks also frequently use these batteries.
Statistical data shows that hearing aids and cochlear implants account for over 36% of button battery use. Games and toys follow at 22%, while watches use about 11%. Remote controls, including car remotes and garage door openers, also rely on cr battery technology. Less common uses include medical equipment, fitness trackers, and even greeting cards.
Manufacturers design different button battery types to meet the needs of various devices. Understanding these applications helps users choose the right battery and avoid compatibility issues. Selecting the correct cr battery ensures optimal device performance and safety.
CR Battery Sizes Chart
CR Battery Size Codes
Manufacturers use a standardized code to identify each cr battery size. The code starts with "CR," which stands for lithium manganese dioxide chemistry and a round, coin-shaped cell. The numbers that follow reveal the battery’s dimensions. The first two digits show the diameter in millimeters. The last two digits indicate the thickness in tenths of a millimeter. For example, a CR2032 battery has a diameter of 20 mm and a thickness of 3.2 mm. This system helps users and engineers quickly determine if a cr battery will fit a device.
The International Electrotechnical Commission (IEC) created this naming convention to ensure that cr battery sizes remain consistent worldwide. This approach allows for easy mechanical interchangeability and reduces confusion when selecting a replacement. The chart below shows how the code matches the actual size:
| Number Code | Nominal Diameter (mm) | Tolerance (mm) |
|---|---|---|
| 10 | 10.0 | ±0.20 |
| 12 | 12.5 | ±0.25 |
| 16 | 16.0 | ±0.25 |
| 20 | 20.0 | ±0.25 |
| 23 | 23.0 | ±0.50 |
| 24 | 24.5 | ±0.50 |
Tip: To find the size of a cr battery, read the code. For example, CR2016 means 20 mm diameter and 1.6 mm thickness.
Size, Voltage, and Capacity
Each cr battery size offers a unique combination of diameter, thickness, voltage, and capacity. Most cr batteries provide a stable voltage of 3.0 volts. The capacity, measured in milliampere-hours (mAh), depends on the battery’s size. Thicker and larger batteries store more energy and last longer. For example, a CR2032 battery holds more charge than a CR2016 battery, even though both have the same diameter.
The table below compares the most common button battery sizes, including their dimensions, voltage, capacity, and typical uses:
| Battery Model | Diameter (mm) | Thickness (mm) | Voltage (V) | Capacity (mAh) | Weight (g) | Common Uses |
|---|---|---|---|---|---|---|
| CR2032 | 20 | 3.2 | 3.0 | 210-240 | ~3.0 | Watches, motherboards, glucose meters, toys |
| CR2025 | 20 | 2.5 | 3.0 | 150-170 | ~2.6 | Remotes, fitness trackers, key fobs |
| CR2016 | 20 | 1.6 | 3.0 | 90-100 | ~1.7 | Calculators, car remotes, medical devices |
| CR1632 | 16 | 3.2 | 3.0 | 120-140 | ~2.0 | Key fobs, fitness devices, medical sensors |
| CR2430 | 24.5 | 3.0 | 3.0 | 270-300 | ~4.2 | Clocks, remote controls, security devices |
| CR1220 | 12.5 | 2.0 | 3.0 | 35-40 | ~0.9 | Watches, calculators, fitness trackers |
| CR1025 | 10 | 2.5 | 3.0 | 30 | ~0.7 | Small electronics, medical devices |
| CR1216 | 12.5 | 1.6 | 3.0 | 25 | ~0.8 | Watches, calculators |
| CR1225 | 12.5 | 2.5 | 3.0 | 48 | ~1.0 | Watches, medical devices, toys |
| CR1612 | 16 | 1.2 | 3.0 | 25 | ~1.0 | Small remotes, sensors |
Note: Actual capacity and weight can vary slightly between manufacturers. Always check the device manual for the recommended cr battery size.
Popular CR Battery Sizes
Some cr battery sizes appear more often in consumer electronics due to their balance of size, capacity, and compatibility. The CR2032 battery stands out as the most widely used. It powers computer motherboards, watches, glucose meters, and toys. The CR2025 and CR2016 batteries also rank high in popularity. They fit slim devices like car remotes, calculators, and medical tools.
A closer look at CR2025 and CR2032 batteries shows that both share a 20 mm diameter and 3.0 V output. The CR2032 is thicker and heavier, offering a higher capacity of up to 240 mAh. This makes it ideal for devices that need longer battery life or higher power. The CR2025, with its thinner profile, suits compact gadgets where space is limited. Both batteries use lithium manganese dioxide chemistry, which ensures a long shelf life and stable performance.
| Feature | CR2025 | CR2032 |
|---|---|---|
| Diameter | 20 mm | 20 mm |
| Thickness | 2.5 mm | 3.2 mm |
| Capacity | 150-170 mAh | 210-240 mAh |
| Weight | ~2.6 grams | ~3.0 grams |
| Voltage | 3.0 V | 3.0 V |
| Chemistry | Lithium Manganese Dioxide | Lithium Manganese Dioxide |
| Applications | Remotes, watches, fitness trackers, key fobs | Watches, motherboards, glucose meters, toys |
The CR2016 battery, though thinner and lighter, remains a favorite for ultra-slim devices. Other common button battery sizes, such as CR1632, CR2430, and CR1220, serve specialized roles in key fobs, clocks, and fitness trackers. Consumers should always match the cr battery size to the device’s requirements for best results.
Reminder: Choosing the correct cr battery size ensures safe operation and prevents device damage. Always refer to the size chart and naming code before purchasing a replacement.
Performance & Lifespan
How Size Affects Capacity
Battery size plays a major role in determining how much energy a device can store and use. Larger CR batteries hold more energy, which means they last longer in most devices. For example, the CR2430 coin cell, with a diameter of 24.5 mm and thickness of 3.0 mm, offers a capacity between 270 and 290 mAh at a steady 3.0 volts. This high capacity comes from its larger size and advanced lithium manganese dioxide chemistry. Devices that need more power, such as medical monitors or security devices, often use these bigger batteries.
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Increasing battery size in electric vehicles from 28 kWh to 116 kWh raises energy consumption by up to 16.9%.
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Long-distance drivers with larger batteries make 260 fewer charging stops each year.
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Doubling battery range increases total cost of ownership by up to 23%.
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Larger batteries also increase greenhouse gas emissions, especially for urban commuters.
These facts show that while a bigger cr battery size provides more energy, it can also lead to higher costs and environmental impact. In small electronics, a larger button battery means longer use between replacements, but only if the device can fit the bigger cell.
Lifespan Differences by Size
The lifespan of a cr battery depends on both its size and how the device uses it. Thicker and wider batteries, like the CR2450, can deliver up to 620 mAh, making them ideal for devices that need long-lasting power. In contrast, thinner models such as the CR1620, with a capacity of 70-78 mAh, suit slim devices with lower energy needs. Temperature, discharge rate, and storage conditions also affect how long a button battery will last. Devices that draw more current will drain even a large cr battery faster.
| Battery Type | Diameter (mm) | Thickness (mm) | Voltage (V) | Capacity (mAh) | Application Suitability |
|---|---|---|---|---|---|
| CR1620 | 16 | 2.0 | 3.0 | 70-78 | Slim remote controls, compact medical devices |
| CR1632 | 16 | 3.2 | 3.0 | 130-140 | High-end digital watches, fitness trackers |
A thicker battery like the CR1632 lasts almost twice as long as the CR1620 in similar devices. Choosing the right cr battery size ensures the device works reliably and does not require frequent replacements.
Choosing the Right CR Battery Size
Selecting the correct cr battery for a device involves more than just matching the code. Users must consider the device’s power needs, available space, and how often the device gets used. Using a battery that is too small may cause short runtimes or even device failure. A battery that is too large may not fit or could damage the device.
| Battery Type | Diameter (mm) | Thickness (mm) | Voltage (V) | Capacity (mAh) | Application Suitability |
|---|---|---|---|---|---|
| CR2032 | 20 | 3.2 | 3.0 | 220 | Calculators, watches, small medical devices |
| CR2430 | 24.5 | 3.0 | 3.0 | 270-290 | Calculators, watches, small medical devices |
| CR2450 | 24.5 | 5.0 | 3.0 | 540-620 | Automotive fobs, larger medical devices, backup power sources |
A CR2430 offers more capacity than a CR2032 but may not fit in every device. The CR2450 provides even more power but requires more space. Users should always check the device manual and compare the cr battery size to ensure proper fit and performance.
Tip: Always use the recommended button battery for your device. The right choice improves safety, extends lifespan, and prevents damage.
Voltage, Chemistry & Safety
Standard Voltage for CR Batteries
Most CR batteries deliver a consistent voltage of 3.0 volts. This stable output supports reliable operation in devices such as watches, medical sensors, and remote controls. The voltage remains the same across different CR battery sizes, which helps simplify device design and replacement. Manufacturers choose this voltage because it matches the needs of many small electronics. Devices that require steady power benefit from this uniform voltage, reducing the risk of malfunction.
Note: The 3V standard makes it easy to swap batteries between devices that use the same size, as long as the chemistry matches.
Chemistry Types
CR batteries use lithium-based chemistries to achieve high energy density and long shelf life. The most common chemistry is lithium manganese dioxide (LiMnO2). This type offers stability, long-lasting power, and good performance in both hot and cold environments. Devices like hearing aids, fitness trackers, and remote controls often use this chemistry.
Some CR batteries use lithium iron disulfide (LiFeS2). This chemistry provides enhanced safety and works well in high-power devices such as cameras. The chemistry type affects how the battery performs, especially under extreme temperatures. Lithium-based chemistries excel in both cold and hot conditions, making them suitable for a wide range of applications.
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CR batteries are non-rechargeable due to their chemistry.
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Attempting to recharge a CR battery can cause damage, overheating, or leakage.
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Rechargeable batteries, such as lithium-ion or nickel-metal hydride, use different chemical compositions and are not interchangeable with CR batteries.
Manufacturers select specific chemistries to balance voltage stability, shelf life, and safety. Comparative studies of lithium-ion battery cathode chemistries show that the choice of minerals like manganese, cobalt, and nickel influences energy density and performance. These insights help guide the development of safer and more efficient batteries.
Safety and Disposal
Proper handling and disposal of CR batteries protect both people and the environment. Lithium batteries contain materials that can harm health and ecosystems if not disposed of correctly. Only about 5% of lithium-ion batteries were recycled globally in 2022, which highlights the need for better recycling practices.
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Never throw CR batteries in regular trash or recycling bins.
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Use designated drop-off locations or manufacturer take-back programs.
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Recycling recovers valuable metals and reduces environmental harm.
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Improper disposal can cause fires, toxic gas release, or contamination.
Rechargeable lithium-ion batteries, which contain metals like cobalt, copper, nickel, and lead, pose even greater risks if not handled properly. Regulations and recycling programs aim to reduce these dangers by encouraging safe recovery and reuse of battery materials. Following proper disposal guidelines helps prevent pollution and conserves resources.
Tip: Always check local regulations for battery recycling and use approved collection points to keep your community safe.
Selecting the correct CR battery size and specification ensures devices work safely and efficiently. Readers can use the size chart and naming guide for quick reference when choosing replacements.
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Always check the device manual before buying a new battery.
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Recycle used button batteries at approved collection points to protect the environment.
Proper battery selection and disposal help keep devices reliable and communities safe.
FAQ
What does the "CR" in CR batteries mean?
The "CR" prefix stands for lithium manganese dioxide chemistry and a round, coin-shaped cell. This code helps users identify the battery type and ensures compatibility with many electronic devices.
Can you replace a CR2032 battery with a CR2025?
A CR2032 and a CR2025 have the same diameter but different thicknesses. Some devices accept both, but others require the exact size. Always check the device manual before making a substitution.
How should you store unused CR batteries?
Store CR batteries in a cool, dry place. Keep them away from metal objects and direct sunlight. Use the original packaging or a battery case to prevent short circuits and accidental discharge.
Are CR batteries safe for children and pets?
CR batteries can pose choking and chemical burn hazards. Keep them out of reach of children and pets. If swallowed, seek medical help immediately.
How do you know when a CR battery needs replacing?
Devices may show warning signs like dim screens, weak signals, or failure to turn on. Use a battery tester or replace the battery if performance drops. Always recycle used batteries responsibly.
Written by Jack from AIChipLink.
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