Key fobs have become indispensable tools in our daily lives, offering seamless access to our vehicles, homes, and even secure facilities. These compact devices rely on small, yet powerful, coin cell batteries to function. Among the most common types are the CR2016 and CR2032 batteries. While they may appear identical at first glance, understanding the subtle yet significant differences between them is crucial for ensuring optimal performance and longevity of your key fob. This article delves into the specifics of CR2016 and CR2032 batteries, comparing their specifications, uses, compatibility, and offering guidance on choosing the right one for your needs.
Understanding Coin Cell Batteries
Coin cell batteries, also known as button cells, are small, round, and flat batteries commonly used in electronic devices that require a compact power source. Their name originates from their resemblance to coins. These batteries are known for their long shelf life and consistent power output, making them ideal for low-drain applications like key fobs, watches, calculators, and medical devices. The “CR” designation indicates that the battery is a lithium battery with a manganese dioxide cathode. The numbers that follow represent the battery’s physical dimensions.
Decoding the CR2016 and CR2032 Nomenclature
The naming convention for coin cell batteries provides valuable information about their size. In the case of CR2016 and CR2032, the first four digits indicate the battery’s dimensions. “20” signifies a diameter of 20 millimeters, while “16” and “32” represent the thickness in tenths of a millimeter. Therefore, a CR2016 battery is 20mm in diameter and 1.6mm thick, whereas a CR2032 battery is 20mm in diameter and 3.2mm thick. This difference in thickness is the most fundamental distinction between the two battery types.
Detailed Comparison: CR2016 vs. CR2032
While both CR2016 and CR2032 batteries share the same diameter, their differences in thickness have implications for their capacity, voltage, lifespan, and suitability for various applications.
Key Specifications
Here’s a detailed look at the key specifications of each battery:
- CR2016:
- Diameter: 20mm
- Thickness: 1.6mm
- Voltage: 3V (typically)
- Capacity: 75-90 mAh (milliampere-hours) approximately
- CR2032:
- Diameter: 20mm
- Thickness: 3.2mm
- Voltage: 3V (typically)
- Capacity: 220-240 mAh (milliampere-hours) approximately
The capacity, measured in mAh, indicates the amount of electrical charge the battery can store and deliver. A higher mAh rating translates to a longer battery life, assuming similar usage patterns.
Voltage and Lifespan Considerations
Both CR2016 and CR2032 batteries operate at a nominal voltage of 3V. This means they provide the same electrical potential. However, the difference in capacity significantly impacts their lifespan. The CR2032, with its higher mAh rating, will generally last much longer than the CR2016 in the same device. The exact lifespan depends on the device’s power consumption and usage frequency. Devices with higher power demands will deplete the battery faster, regardless of whether it’s a CR2016 or CR2032.
Physical Dimensions and Compatibility
The difference in thickness is the primary factor to consider when determining compatibility. While both batteries have the same diameter, the CR2032’s increased thickness may prevent it from fitting properly in devices designed for CR2016 batteries. Attempting to force a CR2032 into a CR2016 slot could damage the device or the battery itself. Conversely, a CR2016 battery may fit loosely in a CR2032 compartment, potentially leading to intermittent contact and unreliable performance.
Practical Applications and Usage Scenarios
CR2016 and CR2032 batteries are used in a wide range of electronic devices. Understanding their common applications can help you choose the appropriate battery for your needs.
Key Fobs and Remote Controls
Key fobs are a very common application for both CR2016 and CR2032 batteries. The choice between the two often depends on the design of the key fob. Some key fobs are specifically designed to accommodate the thicker CR2032 battery for extended battery life, while others are designed for the slimmer CR2016. If your key fob originally uses a CR2016, it is generally not advisable to replace it with a CR2032 unless the battery compartment is specifically designed to accommodate the larger battery. Attempting to do so could damage the key fob.
Watches and Calculators
Smaller electronic devices, such as slim digital watches and basic calculators, often utilize CR2016 batteries due to their compact size. Larger calculators and some digital watches may use CR2032 batteries for longer battery life. The design constraints of these devices often dictate which battery type is most suitable.
Medical Devices and Other Electronics
Certain medical devices, such as heart rate monitors and glucose meters, may also use coin cell batteries. Depending on the device’s power requirements and size constraints, either a CR2016 or a CR2032 battery may be employed. Other electronic devices, like LED lights, small toys, and computer motherboards (for CMOS batteries), also commonly use these battery types.
Can You Substitute CR2032 for CR2016, and Vice Versa?
The question of whether you can substitute a CR2032 for a CR2016, or vice versa, is a common one. The answer, unfortunately, isn’t a simple yes or no. Several factors need to be considered.
Thickness and Physical Fit
The most significant factor is the physical fit. As previously mentioned, the CR2032 is twice as thick as the CR2016. If the battery compartment in your device is designed specifically for a CR2016, a CR2032 will likely not fit. Forcing it could damage the device or the battery.
Contact and Connectivity
Even if you can manage to squeeze a CR2032 into a CR2016 compartment, there’s no guarantee that it will make proper contact with the terminals. Poor contact can lead to intermittent power supply and unreliable performance. Similarly, if you try to use a CR2016 in a CR2032 compartment, it may be too loose to maintain a stable connection.
Potential Risks of Substitution
While in some cases, a substitution might seem to work temporarily, it’s generally not recommended due to potential risks. These risks include:
- Damage to the Device: Forcing the wrong battery size can damage the battery compartment or other internal components.
- Battery Leakage: An improperly fitted battery may be more susceptible to leakage, which can corrode the device’s internal circuitry.
- Reduced Battery Life: Even if the substitution works, the battery life may be significantly reduced due to poor contact or incompatibility with the device’s power requirements.
When a Substitution Might Be Possible (With Caution)
In very rare circumstances, a substitution might be possible, but only with extreme caution and a clear understanding of the risks. For instance, if the battery compartment has some flexibility and you can securely hold the CR2016 in place within a CR2032 compartment (perhaps with a non-conductive shim), it might work. However, this is not recommended as a long-term solution and should only be considered as a temporary fix in an emergency. Always prioritize using the correct battery type specified by the device manufacturer.
Choosing the Right Battery for Your Key Fob
Selecting the correct battery for your key fob is essential for ensuring its proper functionality and longevity. Here are some guidelines to help you make the right choice:
Consult the Device Manual
The first and most reliable source of information is the device’s user manual. The manual should specify the exact battery type required for your key fob. Adhering to the manufacturer’s recommendations will ensure optimal performance and prevent potential damage.
Examine the Old Battery
If you no longer have the device manual, carefully examine the old battery that you are replacing. The battery type (e.g., CR2016 or CR2032) is usually printed directly on the battery itself. This is the easiest and most straightforward way to identify the correct replacement battery.
Consider the Battery Compartment Size
If you are unsure about the battery type and cannot find any identifying marks on the old battery, carefully inspect the battery compartment in your key fob. The size and shape of the compartment will usually indicate which battery type is compatible. If the compartment is shallow, it likely requires a CR2016 battery. If it’s deeper, it’s probably designed for a CR2032.
Prioritize Correct Fit Over Potential Gains
Even if you believe a CR2032 might offer longer battery life, never force a battery into a compartment that is clearly designed for a smaller battery. The potential damage to your key fob is not worth the marginal increase in battery life. Always prioritize a proper fit to ensure reliable performance and prevent damage.
Tips for Extending Battery Life in Your Key Fob
Regardless of whether your key fob uses a CR2016 or CR2032 battery, there are several steps you can take to extend its lifespan:
Avoid Excessive Button Pressing
Repeatedly pressing the buttons on your key fob, especially when out of range, can drain the battery quickly. Avoid unnecessary button presses to conserve power.
Store Your Key Fob Properly
When not in use, store your key fob in a cool, dry place away from direct sunlight and extreme temperatures. Extreme temperatures can negatively impact battery performance and lifespan.
Replace Batteries Promptly
When you notice that your key fob is becoming less responsive or has a shorter range, replace the battery promptly. Waiting too long can lead to battery leakage, which can damage the device.
Consider a Battery Tester
A battery tester can help you monitor the battery’s voltage and determine when it needs to be replaced. This can prevent unexpected battery failures and ensure that your key fob is always ready when you need it.
Purchase Quality Batteries
Invest in reputable battery brands known for their quality and reliability. While cheaper batteries may seem appealing, they often have a shorter lifespan and are more prone to leakage.
Conclusion
Understanding the differences between CR2016 and CR2032 batteries is essential for maintaining the functionality of your key fob and other small electronic devices. While both batteries share the same voltage and diameter, their varying thicknesses and capacities have significant implications for their compatibility and lifespan. Always consult the device manual, examine the old battery, and consider the battery compartment size to choose the appropriate battery type. By following these guidelines and adopting battery-saving practices, you can ensure that your key fob remains a reliable tool for years to come. Remember, prioritizing the correct fit and using quality batteries are the keys to maximizing performance and preventing damage to your valuable devices.
What are the key physical differences between a CR2016 and a CR2032 battery?
The primary physical difference between a CR2016 and a CR2032 battery lies in their thickness. Both batteries share the same diameter, which is 20 millimeters. However, the CR2016 is 1.6 millimeters thick, while the CR2032 is 3.2 millimeters thick. This difference in thickness dictates which battery can fit into a specific device, such as a key fob. It’s crucial to check your device’s specifications before replacing a battery.
Visually, you can identify the batteries by the number printed on them. This number clearly indicates the battery type (CR2016 or CR2032). Attempting to force a thicker CR2032 into a device designed for a CR2016 can damage the device or prevent proper closure. Always use the battery type specified by the manufacturer for optimal performance and safety.
Can I use a CR2032 battery instead of a CR2016 battery in my key fob if it fits?
While a CR2032 might physically fit into a device designed for a CR2016, it is generally not recommended to use it as a direct substitute. The increased thickness of the CR2032 could put undue pressure on the device’s internal components, potentially leading to damage or malfunction. Furthermore, the battery compartment might not be designed to accommodate the slightly larger size, affecting its proper connection and overall functionality.
The CR2032 has a higher energy capacity compared to the CR2016 due to its larger volume. Although this might seem like an advantage, the device’s electronics are designed to operate within specific voltage and current ranges. Using a battery with a different capacity than specified could affect its performance, lifespan, and potentially compromise the device’s safety. Always stick to the recommended battery type for optimal and safe operation.
Does a CR2032 battery last longer than a CR2016 battery?
Yes, a CR2032 battery typically lasts longer than a CR2016 battery. This is because the CR2032 has a larger volume and therefore a higher energy capacity. The energy capacity is directly related to how long a battery can provide power before it is depleted. A CR2032 generally holds about twice the capacity of a CR2016.
The actual lifespan of either battery also depends on the power consumption of the device it is powering. A key fob with frequent usage or advanced features will drain the battery faster. However, under similar usage conditions, the CR2032 will consistently outperform the CR2016 in terms of longevity, meaning fewer battery replacements over time.
What voltage do CR2016 and CR2032 batteries provide?
Both the CR2016 and CR2032 batteries are 3-volt batteries. The “CR” designation in their names signifies that they are lithium coin cell batteries, and lithium batteries typically have a nominal voltage of 3 volts. This voltage is the standard and expected output for both battery types.
The consistent voltage output ensures that both battery types can power devices designed for 3-volt coin cells. While the current capacity differs, the voltage remains the same. This is a crucial factor in their interchangeability within the limits of physical fit and device compatibility. Always verify the voltage requirement of your device before inserting any battery, though for coin cells, 3V is the standard.
Where can I find the correct battery type for my key fob?
The easiest way to find the correct battery type for your key fob is to check the owner’s manual for your vehicle. The manual will usually list the recommended battery type for the key fob. If you no longer have the owner’s manual, you can often find a digital version online on the manufacturer’s website.
Another method is to open the key fob and visually inspect the old battery. The battery type (e.g., CR2016 or CR2032) is typically printed directly on the battery itself. Once you have identified the correct battery type, you can purchase a replacement from most drug stores, electronics stores, or online retailers.
Are CR2016 and CR2032 batteries rechargeable?
No, standard CR2016 and CR2032 batteries are not rechargeable. They are primary lithium batteries, meaning they are designed for single use and cannot be recharged. Attempting to recharge them can be dangerous and could lead to leakage, explosion, or fire.
While there are rechargeable coin cell batteries available, they usually have a different naming convention and chemistry (e.g., LIR2032, which uses lithium-ion technology). These rechargeable batteries require specific chargers and are not directly interchangeable with standard CR2016 or CR2032 batteries. Using the wrong charger or battery type can damage both the battery and the device.
What should I do with used CR2016 or CR2032 batteries?
Used CR2016 and CR2032 batteries should be disposed of properly to prevent environmental contamination. These batteries contain lithium and other materials that can be harmful if they leak into the soil or water. Never dispose of them in regular household trash.
The best way to dispose of used coin cell batteries is to recycle them. Many electronics stores, hardware stores, and municipal waste centers have battery recycling programs. You can also check with your local government for information on hazardous waste disposal events. By recycling, you help recover valuable materials and prevent pollution.