Lithium coin cells like the CR2025 and CR2032 are small but basic power sources for everyday electronics. Both deliver 3V and share the same 20 mm diameter, yet differ in thickness, capacity, and runtime. This CR2025 vs CR2032 comparison highlights their specifications, applications, and key differences to help you choose the right battery for your device.
What is a CR2032 Battery?
The CR2032 is a primary (non-rechargeable) lithium coin cell measuring 20 mm in diameter and 3.2 mm in thickness. It delivers a nominal 3 V output with a typical capacity between 220 and 240 mAh. Weighing about 2.9 g, the CR2032 is the most widely used coin battery worldwide. Its higher energy reserve and stable discharge curve make it a top choice for devices requiring longer service life, such as motherboards, key fobs, and medical sensors.
What is a CR2025 Battery?
The CR2025 is a slimmer coin cell with the same 20 mm diameter but only 2.5 mm thickness. Its typical capacity ranges from 165 to 170 mAh, with a weight of about 2.3 g. While it provides less runtime than the CR2032, the thinner design makes it ideal for compact devices where space is limited, including slim remotes, calculators, and lightweight gadgets.
CR2032 and CR2025 Features and Benefits
CR2032
• Higher capacity (220–240 mAh): Offers longer runtime, making it reliable for devices that operate continuously or need backup power.
• Stable 3 V discharge curve: Provides consistent voltage delivery, ensuring steady device performance over time.
• Widely supported: Compatible with many industrial and consumer devices, from computer motherboards to key fobs.
• Moderate current handling: Suitable for applications requiring bursts of current while still maintaining efficiency.
CR2025
• Slim 2.5 mm profile: Designed for space-restricted electronics where thickness is critical.
• Dependable discharge: Maintains stable performance in low-drain devices such as remote controls and small calculators.
• Good pulse response: Handles intermittent loads well, supporting devices that operate in short bursts.
• Lightweight and economical: Offers a balance of functionality and cost-effectiveness for compact gadgets.
Technical Specifications of CR2032 and CR2025
| Parameter | CR2025 | CR2032 |
|---|---|---|
| Nominal Voltage | 3 V | 3 V |
| Typical Capacity | 165–170 mAh | 220–240 mAh |
| Thickness | 2.5 mm | 3.2 mm |
| Diameter | 20 mm | 20 mm |
| Weight | \~2.3 g | \~2.9 g |
| Operating Temp Range | −30 °C to +60 °C | −30 °C to +60 °C |
Applications of CR2032 and CR2025
CR2032
• Motherboards (RTC backup memory): Keeps system time and BIOS settings accurate when the PC is powered off.
• Automotive key fobs: Provides reliable power for frequent locking, unlocking, and remote-start functions.
• Security system panels: Ensures continuous operation of sensors and alarms during battery-only operation.
• Fitness trackers and health sensors: Supports continuous data logging and wireless communication.
• Weapon sighting systems: Powers optics requiring stable voltage in dangerous environments.
• LED devices and smart wearables: Extends operating life for gadgets needing longer service between replacements.
CR2025
• Ultra-slim remote controls: Fits thin designs without adding bulk while delivering dependable performance.
• Compact calculators: Powers basic electronics that consume little current over long durations.
• Lightweight toys: Provides safe, efficient energy for small, intermittent play devices.
• Thin handheld gadgets: Supports portable devices where every millimeter of thickness matters.
Similarities Between CR2025 and CR2032
• Same chemistry (Li-MnO₂): Both batteries use lithium manganese dioxide, known for stability, safety, and consistent discharge.
• Identical diameter (20 mm): They share the same footprint, making them interchangeable in holders that allow for thickness variation.
• Nominal 3 V output: Each delivers a standard 3 volts, suitable for most small electronic circuits.
• Long shelf life: When stored properly, both can last up to 10 years, retaining most of their charge.
• Single-use design: Neither is rechargeable, as they are built for disposable, primary cell applications.
Differences of CR2025 and CR2032
• Thickness: The CR2025 is thinner at 2.5 mm, while the CR2032 measures 3.2 mm. This difference affects compatibility with battery holders and slim devices.
• Capacity: The CR2025 typically provides around 165 mAh, compared to about 225 mAh for the CR2032, giving the latter a clear edge in energy storage.
• Runtime: Because of its higher capacity, the CR2032 can power the same device for a longer period before replacement is needed.
• Weight: At roughly 2.9 g, the CR2032 is slightly heavier than the 2.3 g CR2025, though both remain very lightweight for portable electronics.
Substitution with Other Coin Cells
| Model | Diameter | Thickness | Voltage | Capacity | Notes |
|---|---|---|---|---|---|
| CR2016 | 20 mm | 1.6 mm | 3 V | \~90 mAh | Very thin; short runtime |
| CR2025 | 20 mm | 2.5 mm | 3 V | \~165 mAh | Slim profile |
| CR2032 | 20 mm | 3.2 mm | 3 V | \~225 mAh | Standard with best runtime |
| CR2450 | 24.5 mm | 5.0 mm | 3 V | \~500 mAh | Larger, not interchangeable |
| LR44 | 11.6 mm | 5.4 mm | 1.5 V | \~120 mAh | Different chemistry; not a substitute |
Battery Safety and Handling Tips
• Storage: Keep coin cells in a cool, dry place, ideally between 15–25 °C. Avoid high humidity or heat, which can shorten shelf life.
• Packaging: Leave batteries in their original packaging until ready for use. This prevents accidental short circuits if the cells touch each other or metal objects.
• Mixing: Never mix old and new cells, or different models, in the same device, as this can lead to leakage or uneven discharge.
• Child safety: Coin cells are small enough to be swallowed, posing a choking and ingestion hazard. Always store them out of children’s reach and opt for child-resistant packaging when available.
• Disposal: Used cells should be recycled through approved collection points. Do not throw them in household trash or burn them, as improper disposal can release harmful materials.
Testing and Replacement Procedure
Testing with a Multimeter:
Set the meter and switch to DC voltage mode, typically the 20 V range. Touch the red probe to the positive (+) side of the coin cell and the black probe to the negative (−) side.
• Interpret results:
–3.0 V: Battery is in good working condition.
–2.6 V: Nearing the end of usable life; plan for replacement soon.
Below 2.5 V: Insufficient charge, replace immediately to prevent device malfunction.
Conclusion
Choosing between CR2025 and CR2032 depends on balancing size and power. The CR2025 fits slim devices, while the CR2032 lasts longer thanks to higher capacity. Both deliver stable 3V performance with long shelf life. By understanding their differences, you can select the right coin cell to ensure reliable operation and fewer replacements for your electronics.
Frequently Asked Questions [FAQ]
Can I use a CR2032 instead of a CR2025?
Yes—if the battery holder allows the extra 0.7 mm thickness. The CR2032 will last longer due to its higher capacity, but it may not fit properly in devices designed only for the thinner CR2025.
How long do CR2025 and CR2032 batteries last in storage?
Both have a shelf life of up to 8–10 years when stored at room temperature in dry conditions. Proper storage ensures they retain most of their charge until use.
Are CR2025 and CR2032 batteries rechargeable?
No. Both are primary lithium coin cells and not designed for recharging. Attempting to recharge them can cause leakage or rupture. For rechargeable options, look for LIR or ML coin cells.
What happens if I put a thinner CR2025 in place of a CR2032?
The device may work, but contact might be loose, and runtime will be shorter due to lower capacity. In some holders, the battery can shift and cause intermittent power loss.
Do CR2025 and CR2032 batteries work in extreme temperatures?
Yes. Both typically operate between −30 °C and +60 °C. However, performance decreases at temperature extremes, runtime shortens in cold, while heat accelerates self-discharge.