What Is a CR1216 Battery and How Does It Power Your Devices?

The CR1216 is a 3V lithium coin cell battery commonly used in small electronics like car key fobs, calculators, and medical devices. Measuring 12mm in diameter and 1.6mm in height, it provides long-lasting power with a typical capacity of 25mAh. Its compact size and stable voltage make it ideal for low-drain applications requiring reliable energy.

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How Does the CR1216 Lithium Coin Cell Battery Work?

The CR1216 operates through a lithium manganese dioxide (Li-MnO₂) chemical reaction. Lithium acts as the anode, while manganese dioxide serves as the cathode. This chemistry delivers a steady 3V output, maintains performance across temperatures (-30°C to 60°C), and resists corrosion, ensuring a shelf life of up to 10 years when stored properly.

The battery’s electrolyte consists of a lithium salt dissolved in an organic solvent, enabling efficient ion transfer between electrodes. Unlike alkaline batteries, the CR1216’s chemistry prevents gas buildup, eliminating the risk of swelling during storage. Its low self-discharge rate (less than 1% per year) makes it suitable for emergency devices like smoke detectors. Engineers particularly value its flat discharge curve—the voltage remains near 3V until 90% of capacity is depleted, ensuring consistent device performance.

What Are the Key Specifications of the CR1216 Battery?

The CR1216 features a nominal voltage of 3V, capacity of 25mAh, and dimensions of 12mm x 1.6mm. It weighs approximately 0.7 grams and operates within a -30°C to 60°C range. Its lithium construction ensures leak resistance, making it safer for sensitive electronics compared to alkaline alternatives.

Parameter	Value
Energy Density	270 Wh/kg
Max Continuous Current	0.1mA
Impulse Current	5mA (5s pulse)

The 1.6mm profile allows integration into ultra-thin devices where vertical space is critical. While capacity is lower than larger cells like CR2032, the CR1216 excels in applications prioritizing minimal thickness over runtime. Its stainless steel casing provides 360° insulation against short circuits.

Which Devices Commonly Use CR1216 Batteries?

CR1216 batteries power devices like car remote key fobs, digital thermometers, calculators, LED lights, and fitness trackers. They’re also used in medical tools such as glucose monitors and hearing aids due to their stable voltage and compact design. Industrial sensors and backup memory systems often rely on them for long-term reliability.

How Does the CR1216 Compare to CR1220 and CR2016 Batteries?

The CR1216 is thinner (1.6mm) than the CR1220 (2.0mm) and CR2016 (1.6mm) but shares the same diameter (12mm) as the CR1220. While the CR2016 offers higher capacity (90mAh) due to its larger 20mm diameter, the CR1216 is preferred for ultra-slim devices. Voltage remains consistent across all three at 3V.

What Are the Signs of a Failing CR1216 Battery?

Symptoms include reduced device performance (e.g., dimming key fob LEDs), erratic behavior (intermittent operation), or failure to power on. Voltage testing with a multimeter (readings below 2.5V indicate depletion) and expiration date checks help diagnose issues. Physical swelling or leakage also signals immediate replacement needs.

Can You Recharge a CR1216 Lithium Coin Cell?

No, CR1216 batteries are single-use and not designed for recharging. Attempting to recharge them can cause overheating, rupture, or chemical leaks. For reusable applications, consider lithium-ion alternatives like LIR1216, though these require compatible charging circuits and have different voltage profiles (3.6V nominal).

How Should CR1216 Batteries Be Stored for Maximum Lifespan?

Store CR1216 batteries in cool (15-25°C), dry environments away from direct sunlight. Keep them in original packaging or non-conductive containers to prevent short-circuiting. Avoid extreme temperatures, as heat accelerates self-discharge, while cold can temporarily reduce voltage output. Storage at 50% charge is unnecessary for lithium primaries.

What Environmental Risks Do CR1216 Batteries Pose?

CR1216 batteries contain lithium, manganese dioxide, and organic electrolytes, which can harm ecosystems if improperly disposed. Recycling through certified programs (e.g., Call2Recycle) is critical. Landfill disposal risks soil/water contamination, while incineration may release toxic fumes. Many regions mandate lithium battery recycling under hazardous waste regulations.

Recycling centers use specialized processes to separate lithium from other components. The recovered lithium can be repurposed for steel production, while manganese dioxide finds use in fertilizer manufacturing. Consumers should never disassemble cells—exposed lithium reacts violently with moisture. Retailers in 38 U.S. states are required by law to accept CR1216 batteries for recycling, often providing collection bins near checkout areas.

Expert Views

“The CR1216’s engineering balances energy density and safety,” says Dr. Elena Torres, a battery systems engineer. “Its lithium chemistry minimizes self-discharge, crucial for medical devices needing decade-long reliability. However, users must avoid mixing with alkaline cells in series configurations—voltage mismatches can lead to premature failure or leakage.”

Conclusion

The CR1216 lithium coin cell remains indispensable for compact electronics, offering unmatched voltage stability and longevity. Understanding its specifications, proper handling, and disposal ensures optimal performance and environmental safety. As device miniaturization continues, innovations in lithium-based energy storage will further enhance these power sources’ efficiency and applications.

FAQ

Can I use a CR1220 instead of a CR1216?

No. The CR1220 is 0.4mm thicker (2.0mm vs. 1.6mm), which may not fit in compartments designed for CR1216. Voltage is identical, but capacity differs (35mAh vs. 25mAh). Forced installation risks damaging the device or battery contacts.

How long does a CR1216 last in a key fob?

Typically 1-3 years, depending on usage frequency. Daily use shortens lifespan versus occasional activation. Cold climates may reduce effectiveness temporarily. Test voltage annually and replace below 2.5V.

Are CR1216 batteries allowed on planes?

Yes, both checked and carry-on luggage. The TSA permits lithium coin cells under 2 grams (CR1216 weighs 0.7g). Keep them in original packaging or tape terminals to prevent short-circuiting during transit.