cr2450 button battery
CR2450
CR2450 BATTERY
cr2450 coin battery

Non Rechargeable CR2450 Battery 3V Coin Cell for Key FOB

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Summary of CR2450 3V Battery​

This CR2450 lithium coin cell is a primary (non-rechargeable) Li-MnO2 battery engineered for devices that demand long service life, stable voltage, and environmental compliance. With a large 620mAh nominal capacity, high gravimetric energy density up to 286.15Wh/kg, and reliable pulse discharge capability up to 10mA, it is optimized for key fobs, access control systems, and low-power electronics operating across a wide temperature range from –20°C to 60°C.
The chemistry is mercury-free, meeting global environmental and regulatory expectations for consumer and industrial electronics.

CR2450 Lithium Cell​ Parameters

  • Model: Lithium Coin Cell
  • Chemistry: Lithium Manganese Dioxide (Li/MnO2)   
  • Voltage: 3V 
  • Diameter: 24mm
  • Height: 5mm 
  • Typical Capacity: 620mAh
  • Energy: 1.86Wh
  • Energy Density: 286.15Wh/kg
  • Standard Discharge Current: 0.1mA
  • Max Discharge Current: 1mA
  • Peak Discharge Current: 10mA
  • Internal Resistance: ≤15Ω
  • Weight: 6.5g
  • Operating Temperature: -20°C to +60°C (-4°F to +140°F)
  • Self-Discharge Rate: <1% / year
  • Shelf Life: >10 years
  • Rechargeable: Non Rechargeable

Key Features – CR2450 Lithium Battery​

📦 620mAh High Capacity

The increased internal volume of the CR2450 format allows a significantly higher active material loading compared to smaller coin cells (e.g., CR2032), directly translating to longer replacement intervals.

📈 286.15Wh/kg Energy Density  

This level of gravimetric energy density is near the upper range for primary lithium coin cells, enabling compact device design without sacrificing runtime.

⚙️ Up to 10mA Pulse Discharge

Engineered electrode formulation and internal resistance control allow short-duration current pulses, which are common in RF transmission during key fob operation and wake-up events in access systems. This does not imply continuous high-current discharge and should be evaluated against the actual load profile.

🌡️ Operating Temperature Range

The CR2450 maintains usable performance across a wide temperature window. Low-temperature electrolyte formulation supports cold starts while cathode stability ensures safety at elevated temperatures. For engineers, this range covers automotive interiors, outdoor access systems, and consumer electronics without special thermal compensation.

🌱 Environmental & Regulatory Considerations

This battery contains no added mercury, aligning with RoHS, EU Battery Directive and global environmental compliance standards. From a factory and procurement standpoint, this simplifies regulatory documentation, export clearance, and downstream OEM audits.

🧠 Application-Driven Use Cases

🔑 Key Fobs & Automotive Remotes
High capacity + pulse capability directly address intermittent RF transmission demands.

🚪 Access Control & Security Devices
Long shelf life and low self-discharge reduce maintenance cycles.

⌚ Low-Power Consumer Electronics
Stable voltage profile supports MCU-based designs sensitive to voltage drops.

⚠️ Often Overlooked Points & Common Misconceptions

🚫 “Higher mAh means higher current capability”
Capacity does not equal continuous discharge current. CR2450 supports pulse loads but is not designed for sustained high current.

🔄 “Coin cells can be recharged slowly”
This is incorrect and unsafe. CR2450 is strictly non-rechargeable. Charging can cause leakage, swelling, or rupture.

📉 “All CR2450 batteries perform the same”
Electrode formulation, electrolyte purity, and sealing quality significantly affect pulse performance and shelf life.

🌡️ “Operating temperature equals storage temperature”
Storage conditions outside recommended ranges can accelerate self-discharge and degrade performance before first use.

❓Frequently Asked Questions (FAQ)

Q1: What is the life expectancy of a CR2450 battery?

A: CR2450 battery typically lasts 10+ years, depending on the device’s power consumption, discharge pattern, and operating temperature. In low-drain applications like key fobs or memory backup, its long shelf life and low self-discharge allow it to function for many years before replacement.

Q2 Is 10mA pulse discharge safe for this battery?

A: Yes, for short durations. Continuous discharge at this level is not recommended and should be validated against the duty cycle.

Q3: Are CR2032 and CR2450 batteries interchangeable?

A: CR2032 and CR2450 batteries are not interchangeable because they have different thicknesses and capacities, even though both are 3V lithium coin cells. Using the wrong size can cause poor contact, unstable operation, or prevent the device from closing properly.

Q4: How to test if a CR2450 battery is still good?

A: Measure the battery with a multimeter: a healthy CR2450 should read close to 3.0V with no load. For a more accurate check, test it under a light load—if the voltage drops quickly, the battery is near end of life.

Q5: Is the BMW key battery CR2450 or CR2032?

A: It depends on the BMW model and key design: many newer BMW smart keys use a CR2450, while some older or slimmer keys use CR2032. The correct battery type is usually printed inside the key housing or listed in the vehicle manual.

Related Battery

CR2032 Lithium 3V Coin Battery​ 230mAh for Key Fob

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