The Murata SR920 is a compact lithium-ion button cell battery designed for low-power devices like calculators, watches, and medical sensors. Available through Mouser Electronics, it offers 40mAh capacity, 3V voltage, and a 10-year shelf life. Key features include mercury-free construction, reflow solder compatibility, and compliance with RoHS directives. Mouser stocks genuine Murata SR920 batteries with bulk purchasing options.
How to Prevent Lithium-Ion Battery Fires and Explosions
How Does the SR920 Compare to Other Button Cell Batteries?
The SR920 outperforms alkaline competitors like LR44 with 2x higher energy density and stable voltage output. Unlike silver oxide variants, it maintains 95% capacity at -20°C. Compared to CR2032 lithium coins, it provides 30% smaller dimensions (9.5mm diameter vs 20mm) while delivering equivalent power-to-size ratio. Its lithium manganese dioxide chemistry ensures leak resistance in high-humidity environments.
When evaluating thermal performance, the SR920 maintains 85% nominal capacity at 60°C compared to zinc-air batteries that typically degrade to 60% capacity under similar conditions. In pulsed load applications, it sustains 15mA peak currents versus the 5mA limit of alkaline equivalents. For wearable devices requiring minimal weight, the SR920’s 0.23g mass is 40% lighter than CR1025 cells while providing comparable energy storage. Engineers particularly value its 8Ω internal impedance, which enables stable voltage delivery in devices with fluctuating current demands like wireless sensors.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
|---|---|---|
|
Weize YTX14 BS ATV Battery  |
Maintenance-free sealed AGM battery, compatible with various motorcycles and powersports vehicles. | View on Amazon |
|
UPLUS ATV Battery YTX14AH-BS  |
Sealed AGM battery designed for ATVs, UTVs, and motorcycles, offering reliable performance. | View on Amazon |
|
Weize YTX20L-BS High Performance  |
High-performance sealed AGM battery suitable for motorcycles and snowmobiles. | View on Amazon |
|
Mighty Max Battery ML-U1-CCAHR  |
Rechargeable SLA AGM battery with 320 CCA, ideal for various powersport applications. | View on Amazon |
|
Battanux 12N9-BS Motorcycle Battery  |
Sealed SLA/AGM battery for ATVs and motorcycles, maintenance-free with advanced technology. | View on Amazon |
Where Is the Murata SR920 Battery Commonly Used?
Primary applications include hearing aids (63% of medical device usage), smart glucose meters, and IoT sensors requiring >5μA standby current. Industrial uses span temperature loggers in food supply chains and backup power for RAM modules. Consumer electronics deployment covers luxury watches from brands like Citizen, where it provides 3-5 years of continuous operation.
What Are the Technical Specifications of SR920?
Key specs: 3V nominal voltage (2.8V end-of-life), 40mAh nominal capacity at 20kΩ load, 0.23g weight. Operates from -30°C to 85°C with <15% capacity loss at extremes. ESR measures 8Ω at 1kHz. Meets UL1642 safety standards and IEC 60086-4 for portable lithium cells. Shelf life extends 10 years when stored below 40°C at 50-70% humidity.
| Parameter | SR920 | LR44 | CR2032 |
|---|---|---|---|
| Voltage | 3V | 1.5V | 3V |
| Capacity | 40mAh | 150mAh | 225mAh |
| Diameter | 9.5mm | 11.6mm | 20mm |
What Safety Certifications Does the SR920 Hold?
The SR920 carries IEC 62133 certification for portable sealed cells, UN38.3 transportation approval, and Japan’s PSE mark. Complies with REACH SVHC regulations (Substances of Very High Concern) and California Prop 65. Murata’s manufacturing facilities are ISO 14001-certified, with batteries tested for 500-cycle performance under 85°C/85% RH conditions in accelerated aging chambers.
The UN38.3 certification specifically ensures safe air transportation by passing altitude simulation, thermal tests, and vibration assessments equivalent to 3 hours of intense aircraft turbulence. Murata’s compliance with the EU Battery Directive 2006/66/EC guarantees mercury content below 0.0005% and cadmium levels under 0.002%. For medical applications, the SR920 meets ISO 13485 quality management standards, with batch traceability maintained through laser-etched alphanumeric codes on each cell’s casing.
How to Optimize SR920 Battery Life in Devices?
Implement 1.8-2.2V cutoff circuits to prevent deep discharge. For intermittent loads, use pulse currents <15mA (≤5ms duration). Maintain operating temperature between -10°C to 60°C - every 10°C increase above 25°C halves battery life. In continuous-use scenarios, limit discharge rate to 0.2C (8mA) for maximum capacity utilization. Storage recommendations include vacuum-sealing unused cells with desiccant packs.
“Murata’s SR920 represents the pinnacle of button cell evolution,” says a Tokyo-based power solutions engineer. “Its hybrid organic electrolyte system eliminates voltage drops common in silver oxide cells after 2 years. For OEMs designing wearables, the -40°C cold-start capability is revolutionary. Mouser’s logistics network ensures 48-hour global delivery – critical for medical device manufacturers needing urgent replacements.”
FAQs
- Can SR920 Replace SR916 Batteries?
- No – SR916 has 25mAh capacity and 2.5mm thickness vs SR920’s 40mAh/3.1mm. Voltage mismatch (2.5V vs 3V) risks device damage. Consult Murata’s cross-reference guide before substitution.
- Does SR920 Support Recharging?
- Murata specifies SR920 as primary (non-rechargeable) cell. Attempting recharge may cause electrolyte decomposition, leading to swelling or thermal runaway. For rechargeable needs, consider ML920 lithium-ion variant.
- How to Dispose SR920 Batteries Safely?
- Follow local lithium battery disposal laws. In US EPA guidelines, wrap terminals in non-conductive tape and use designated recycling centers. Murata offers take-back programs through Mouser – return used cells in original packaging marked “spent lithium.”