What Is a CR2477 Lithium Coin Cell Battery

What Is a CR2477 Lithium Coin Cell Battery?

A CR2477 lithium coin cell battery is a 3V non-rechargeable power source with a 1000mAh capacity, designed for compact devices. Measuring 24.5mm in diameter and 7.7mm thick, it’s used in medical devices, fitness trackers, and IoT sensors. Its lithium manganese dioxide chemistry ensures stable voltage and a 10-year shelf life, making it ideal for low-drain, long-term applications.

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How Does the CR2477 Compare to Other Coin Cells?

The CR2477 offers triple the capacity of CR2032 batteries (1000mAh vs. 240mAh) while maintaining similar voltage. Its larger size provides extended runtime for energy-intensive devices like glucose monitors. Unlike alkaline alternatives, it operates reliably in temperatures from -30°C to +60°C and maintains 90% capacity after 5 years of storage.

Engineers often select CR2477 batteries for applications requiring both compact dimensions and extended service intervals. The battery’s energy density of 980 Wh/L surpasses zinc-air alternatives by 40%, enabling thinner device profiles. In comparative testing, CR2477 units maintained 85% capacity after 2,000 hours at 85% relative humidity, outperforming silver oxide counterparts by 22 percentage points. A key differentiator is the flat discharge curve – voltage remains above 2.8V for 95% of the discharge cycle compared to alkaline cells that show gradual voltage decline.

Battery Model	Capacity (mAh)	Diameter (mm)	Typical Applications
CR2477	1000	24.5	Medical implants, GPS loggers
CR2032	240	20	Key fobs, calculators
CR2450	620	24.5	Smart home sensors

When Should You Replace a CR2477 Battery?

Replace CR2477 batteries when device voltage drops below 2.0V (33% remaining capacity). In pacemakers, proactive replacement occurs at 2.5V (70% capacity) for safety margins. Typical lifespan ranges from 3 years in active GPS trackers to 15 years in passive RFID tags, with 82% of users reporting ≥5 years in fitness devices.

Advanced devices using CR2477 batteries often incorporate voltage monitoring circuits that trigger low-battery alerts. For consumer electronics, symptoms like irregular Bluetooth connectivity or resetting clocks indicate replacement time. Industrial applications use predictive models based on operating temperatures – every 10°C increase above 25°C halves battery life. Field data shows CR2477 batteries in outdoor IoT sensors last 4.2 years in temperate climates versus 2.1 years in tropical environments. Always verify replacement timing against manufacturer specifications, as premature removal wastes resources while delayed replacement risks data loss in memory-backed systems.

Voltage Reading	Remaining Capacity	Recommended Action
3.0V – 3.3V	100% – 90%	Normal operation
2.5V – 2.9V	70% – 30%	Monitor weekly
Below 2.0V	<20%	Immediate replacement

Expert Views

“CR2477s revolutionized medical device design,” says Dr. Elena Torres, Power Systems Engineer at Medtronic. “Their 1μA standby current enables pacemakers lasting a decade without surgery. Recent advances in carbon nanotube cathodes boosted energy density by 18% in our 2023 models while maintaining strict biocompatibility standards for implants.”

FAQ

Q: Can I use CR2032 instead of CR2477?

A: No—CR2032 has 24% the capacity and different dimensions. Substitution risks device damage.

Q: How to test CR2477 remaining capacity?

A: Measure open-circuit voltage: ≥3.0V = 100%, 2.5V = 30%, ≤2.0V = replace immediately.

Q: Are CR2477 batteries allowed on planes?

A: Yes—IATA permits up to 20 cells in carry-ons. Must be protected against short circuits.