Renata CR2450N (Lithium Coin)

Overview

The Renata CR2450N is a primary (non-rechargeable) 3 V lithium coin cell for devices that need long standby time and dependable low-to-moderate current. It shares the same 24.5 mm diameter and 5.0 mm height as a standard CR2450 but uses an "N" terminal/rim profile required by certain battery holders. Common uses include professional instruments, medical sensors, asset/GPS trackers, and IoT beacons.

Key Specifications

Chemistry	Lithium Manganese Dioxide (Li-MnO₂)
Nominal voltage	3.0 V
Dimensions	24.5 mm diameter × 5.0 mm height (IEC 2450)
Typical capacity	~540–600+ mAh at low drain to 2.0 V cutoff
Operating temperature	−30 °C to +60 °C (−22 °F to +140 °F)
Shelf life	Up to ~10 years when stored cool and dry (original packaging)
Compliance	Mercury-free, RoHS compliant

When to Choose the CR2450N

• Your device or holder explicitly specifies CR2450N (mechanical terminal/rim profile requirement).
• Average current in the microamp to low milliamp range, with occasional short pulses (e.g., wireless transmissions).
• You want long service intervals in sensors, beacons, remotes, data loggers, or medical peripherals.

When to Avoid

• Sustained high-drain loads above ~1–2 mA; consider a larger cell (e.g., CR2477) or a different chemistry.
• Rechargeable applications; do not substitute with LIR2450 (3.6–3.7 V Li-ion) due to different voltage and charging requirements.
• Environments outside −30 °C to +60 °C or applications with heavy pulse loads without proper energy buffering.

Estimated Runtime Examples

Estimates assume ~550 mAh usable at room temperature with a 2.0 V cutoff. Actual results depend on temperature, duty cycle, and pulse size.

Average load	Approximate runtime
10 µA (ultra-low-power sensor/logger)	4–6 years (may be limited by shelf life/self-discharge)
50 µA (BLE beacon, infrequent advertising)	1–1.5 years
0.2 mA (intermittent LED/sensor)	~3–4 months
1.0 mA (continuous draw)	~3–4 weeks

For pulsed loads (e.g., 10–30 mA radio bursts), add a local storage capacitor (e.g., 47–220 µF low-leakage ceramic or tantalum) close to the load to reduce voltage dip. Keep capacitor leakage low (<1–2 µA) for long-life designs.

Compatibility and Equivalents

• Family: IEC CR2450. Brand codes may include DL2450 (Duracell), ECR2450 (Energizer). Not all brands offer the "N" variant.
• CR2450 vs CR2450N: electrical specs are similar; the N suffix indicates a specific terminal/rim geometry. Some holders require the N version for correct contact and retention.
• Not interchangeable with rechargeable LIR2450 or with different thickness cells such as CR2430 (3.0 mm) or CR2477 (7.7 mm) unless the device is designed for them.

Installation and Handling

• Confirm the marking: CR2450N, 3 V. Match polarity (+/−) as indicated on the holder.
• Use non-metallic tools when possible. Avoid short circuits and do not stack loose cells.
• Clean contacts with isopropyl alcohol and a lint-free swab if needed to reduce contact resistance.
• Store spares in original packaging at 10–25 °C, low humidity; keep away from heat and direct sunlight.
• Do not mix old and new cells or different brands/models in the same device.

Safety Notes

• Child safety: coin cells are a swallowing hazard. Keep out of reach; seek immediate medical attention if ingested.
• Do not recharge, crush, or incinerate. Tape terminals before recycling to prevent short circuits.

Alternatives

• More capacity (if thickness allows): CR2477 (~950–1200 mAh).
• Thinner form factor: CR2430 (3.0 mm thick) with lower capacity.
• If your holder does not require the N profile, a standard CR2450 may fit—verify mechanical compatibility first.

FAQ

What does the “N” in CR2450N mean?

It indicates a specific terminal/rim profile used by some holders. Electrical specs match a CR2450, but mechanical fit can differ. Use CR2450N when specified by your device or holder.

Can I recharge a CR2450N?

No. It is a primary lithium coin cell and must not be recharged. Use a device designed for rechargeable cells if you need rechargeability.

Is CR2450N interchangeable with CR2450?

Sometimes. The electrical characteristics are similar, but the terminal/rim geometry may prevent proper contact or retention. Check your device documentation or test fit before substituting.

How should I dispose of used coin cells?

Recycle through a battery collection program. Do not dispose of in fire. Cover terminals with tape before recycling to prevent short circuits.