Lithium button cell batteries, such as the CR2430 and CR2450, are widely used in small electronic devices. While they share similarities, key differences in size, capacity, and applications set them apart. This article explores these distinctions to help users make informed decisions.

1. Basic Specifications

CR2430

• Dimensions:

• Diameter: 24 mm

• Height: 3.0 mm

• Nominal Voltage: 3 V (standard for lithium manganese dioxide cells).

• Capacity: ~280–300 mAh (milliampere-hours).

• Weight: ~4.2 grams (varies by manufacturer).

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CR2450

• Dimensions:

• Diameter: 24 mm

• Height: 5.0 mm

• Nominal Voltage: 3 V.

• Capacity: ~550–620 mAh (nearly double the CR2430).

• Weight: ~6.0 grams.

2. Key Differences

Physical Size

• Height: The CR2450 is 2.0 mm thicker than the CR2430. This difference affects compatibility in devices with tight battery compartments.

• Diameter: Both share the same 24 mm diameter, allowing them to fit in slots designed for this width.

Capacity

• The CR2450’s larger size grants it significantly higher capacity (~550–620 mAh vs. ~280–300 mAh). This translates to approximately double the runtime in similar applications.

Applications

• CR2430: Ideal for compact devices where space is critical. Common uses include:

• Calculators

• Small medical devices (e.g., glucose monitors)

• Key fobs

• Low-power sensors

• CR2450: Suited for devices requiring extended battery life. Typical applications include:

• High-drain devices (e.g., digital thermometers, LED lights)

• Wearables (e.g., fitness trackers)

• IoT devices

• Car key fobs with advanced features

Interchangeability

• CR2430 → CR2450: Physically incompatible due to the CR2450’s greater height. Forcing it into a CR2430 slot may damage the device.

• CR2450 → CR2430: A CR2430 might fit in a CR2450 compartment if spacers are used, but runtime will be reduced. Not recommended for critical applications.

Price & Availability

• CR2450: Slightly more expensive (e.g., $2\text{–}$5 per unit) due to higher capacity. Widely available but may cost 20–30% more than CR2430.

• CR2430: Typically $1\text{–}$3 per unit. Equally common but less favored in high-drain scenarios.

3. Performance Considerations

• Shelf Life: Both boast a 10-year shelf life under proper storage (cool, dry environments).

• Discharge Rate: Similar flat discharge curves, but the CR2450’s higher capacity sustains voltage longer in high-drain devices.

• Temperature Range: Both operate effectively in -30°C to +60°C, making them suitable for outdoor/industrial use.

4. When to Choose Which Battery?

• Choose CR2430 If:

• Device space constraints exist.

• Power demands are low (e.g., backup memory, infrequently used gadgets).

• Choose CR2450 If:

• Extended runtime is critical.

• The device accommodates the 5.0 mm height.

Conclusion

While the CR2430 and CR2450 share voltage and diameter, their height and capacity differences dictate distinct use cases. The CR2430 excels in compact, low-power devices, while the CR2450 is optimal for energy-intensive applications. Always verify device compatibility to avoid damage or suboptimal performance. Understanding these nuances ensures efficient power management for your electronics.