The CR2050 is a 3V lithium manganese dioxide coin cell battery with a diameter of 20mm, height of 5.0mm, and capacity of 340-360mAh. Designed for low-drain devices like key fobs and medical sensors, it operates between -30°C to 60°C and has a 5-10-year shelf life. Its technical specs prioritize stable voltage and long-term reliability.
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How Does the CR2050 Differ From Other Coin Cell Batteries?
The CR2050 stands out for its 340-360mAh capacity and 20mm diameter, making it bulkier than CR2032 but ideal for devices requiring extended runtime. Unlike alkaline variants, its lithium chemistry ensures stable voltage output even in extreme temperatures. It’s also non-rechargeable, emphasizing single-use applications where energy density matters most.
| Battery Model | Capacity (mAh) | Diameter (mm) |
|---|---|---|
| CR2050 | 340-360 | 20.0 |
| CR2032 | 210-240 | 20.0 |
| LR44 | 110-150 | 11.6 |
What Materials Are Used in CR2050 Battery Construction?
The CR2050 uses lithium manganese dioxide (Li-MnO₂) chemistry. The anode consists of lithium metal, while the cathode is manganese dioxide. A non-aqueous electrolyte enables ion transfer, and a stainless steel casing provides hermetic sealing. This design minimizes self-discharge to 1% per year, outperforming alkaline alternatives.
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The choice of lithium manganese dioxide ensures a high energy-to-weight ratio, critical for portable electronics. The stainless steel casing not only prevents leakage but also resists corrosion from environmental exposure. Advanced separators between electrodes reduce internal short-circuit risks, while the electrolyte’s low volatility enhances safety during temperature fluctuations. These materials collectively enable the battery’s decade-long shelf life and reliability in mission-critical applications like medical implants.
How Does Temperature Affect CR2050 Performance?
CR2050 batteries retain 80% capacity at -30°C and operate up to 60°C. Prolonged exposure above 70°C accelerates electrolyte decomposition, reducing lifespan. Cold temperatures increase internal resistance, temporarily lowering voltage, but lithium chemistry ensures recovery once normalized. Ideal for outdoor sensors and automotive applications with wide thermal ranges.
In sub-zero environments, the battery’s lithium-based electrolyte maintains ionic conductivity better than aqueous alternatives. For instance, automotive tire pressure sensors using CR2050s function reliably during winter storms and desert heat. However, cyclic temperature swings between extremes can cause microscopic lithium dendrite formation, gradually reducing capacity. Manufacturers mitigate this through precision-controlled cathode porosity and optimized separator thickness.
Can CR2050 Batteries Be Recharged Safely?
No. CR2050s are primary (non-rechargeable) cells. Attempting to recharge them risks thermal runaway, leakage, or explosion due to lithium metal instability. For rechargeable needs, consider LIR-series lithium-ion coin cells, though they have lower energy density and higher self-discharge rates.
Expert Views
“The CR2050’s engineering prioritizes longevity over flexibility,” says a senior engineer at a battery manufacturing firm. “Its lithium manganese dioxide chemistry is decades old but remains unmatched for low-drain applications needing decade-long service. However, the industry is shifting toward eco-friendly solid-state designs—expect future iterations with reduced heavy metal content.”
FAQs
- How Long Does a CR2050 Battery Last in Continuous Use?
- At 0.2mA drain, a CR2050 lasts 1,700 hours (≈70 days). Lifespan shortens exponentially with higher current—e.g., 200 hours at 2mA. Shelf life is 10 years if stored below 25°C.
- Are CR2050 and DL2050 Batteries Interchangeable?
- Yes. DL2050 is Duracell’s designation for CR2050. Both share identical dimensions, voltage, and chemistry. Mixing brands in multi-cell devices is safe but may cause slight runtime variations.
- What Is the Proper Way to Store CR2050 Batteries?
- Store in original packaging at 15-25°C, 40-60% humidity. Avoid refrigeration—condensation can corrode contacts. Separate from metals to prevent short circuits. Periodically check voltage if stored beyond 5 years.