The SR621 lithium battery by Murata Electronics, available via Mouser, is a silver oxide button cell renowned for its stable voltage, long lifespan, and compact design. Ideal for small electronics like watches, calculators, and medical devices, it outperforms alkaline alternatives in high-drain applications. Its leak-resistant construction and reliability make it a preferred choice for precision instruments.
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How Does the SR621 Lithium Battery Work?
The SR621 uses silver oxide chemistry to deliver a steady 1.55V output, ensuring consistent performance in low-drain devices. Its layered cathode design minimizes voltage drop over time, making it suitable for applications requiring precision, such as thermometers and hearing aids. The battery’s hermetic seal prevents electrolyte leakage, protecting sensitive components.
What Are the Key Specifications of the SR621 Battery?
The SR621 features a diameter of 6.8mm, height of 2.1mm, and capacity of 13-15mAh. Operating between -30°C to 60°C, it weighs 0.6 grams. Its silver oxide chemistry ensures a shelf life of up to 5 years, with a self-discharge rate of less than 2% annually. Compatible with SR621SW and 364 equivalents.
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Silver oxide chemistry provides a flatter discharge curve compared to alkaline counterparts, maintaining voltage stability even under continuous load. This makes the SR621 ideal for devices requiring precise power management, such as digital calipers or electronic pet collars. The battery’s minimal size-to-energy ratio also allows engineers to design slimmer devices without sacrificing runtime.
| Parameter | SR621 | LR621 (Alkaline) |
|---|---|---|
| Voltage | 1.55V | 1.5V |
| Capacity | 15mAh | 12mAh |
| Temp Range | -30°C to 60°C | -10°C to 50°C |
Where Is the SR621 Battery Commonly Used?
This battery powers devices like wristwatches, calculators, laser pointers, and medical tools (e.g., glucose meters). Its stable voltage suits memory backup in electronics and IoT sensors. Unlike alkaline cells, it maintains efficiency in extreme temperatures, making it ideal for outdoor equipment and automotive key fobs.
In medical applications, the SR621’s reliability is critical for devices like Holter monitors and implantable drug delivery systems. Its leak-proof design prevents corrosive damage to sensitive circuitry, a vital feature in life-sustaining equipment. For IoT devices, the battery’s low self-discharge ensures years of maintenance-free operation in smart sensors monitoring environmental conditions or industrial machinery.
| Device Type | Avg Battery Life |
|---|---|
| Digital Watch | 2-3 Years |
| Glucose Meter | 18 Months |
| Laser Pointer | 6-8 Months |
How to Maximize the SR621 Battery’s Lifespan?
Avoid exposing the SR621 to humidity or temperatures above 60°C. Store in original packaging until use and replace all batteries in a multi-cell device simultaneously. Use insulated tweezers during installation to prevent short-circuiting. For infrequently used devices, remove the battery to minimize passive discharge.
What Are Alternatives to the SR621 Battery?
Equivalent cells include the SR621SW (Switzerland-made), Energizer 364, and Renata 364. Alkaline alternatives like LR621 provide lower cost but shorter lifespan. For high-drain devices, lithium CR1025 or CR1216 may be suitable, though voltage differences (3V vs. 1.55V) require compatibility checks.
Why Choose Murata’s SR621 Over Generic Brands?
Murata’s SR621 undergoes rigorous QA testing, ensuring ±1% voltage tolerance and ISO 9001 compliance. Generic brands often use inferior seals, risking leakage. Murata’s patented cathode mix extends runtime by 20% compared to budget options. Mouser Electronics guarantees authentic Murata cells, backed by traceable lot numbers and manufacturer warranties.
Expert Views
“Murata’s SR621 sets the benchmark for button cell reliability. Its hybrid organic electrolyte reduces dendrite formation, a common failure point in cheaper cells. For OEMs, specifying this battery can cut warranty claims by up to 30% in medical devices.” — John Carter, Senior Engineer, Power Solutions Inc.
Conclusion
The SR621 lithium battery combines Murata’s engineering excellence with practical benefits for both consumers and manufacturers. Its balance of longevity, safety, and environmental compliance makes it a smart investment for critical applications. Always source from authorized distributors like Mouser to avoid counterfeit risks.
FAQs
- Q: Can SR621 batteries be recharged?
- A: No, they are single-use. Attempting to recharge may cause rupture.
- Q: Are SR621 batteries mercury-free?
- A: Yes, Murata eliminated mercury in 2018, complying with RoHS directives.
- Q: How to dispose of SR621 batteries?
- A: Recycle through certified e-waste programs—do not incinerate.