Panasonic CR2450

Panasonic CR2450: What it is

The Panasonic CR2450 is a primary (non-rechargeable) 3V lithium coin cell using Li/MnO2 chemistry. Its larger 24.5 mm diameter and 5.0 mm height let it store more energy than smaller coin cells, making it a solid choice for devices that need longer intervals between replacements.

At a glance

Nominal voltage	3.0 V
Typical capacity	~620 mAh (at low drain)
Size	24.5 mm (diameter) × 5.0 mm (height)
Chemistry	Lithium Manganese Dioxide (Li/MnO2)
Operating range	-22 to 140°F (-30 to +60°C)
Shelf life	Up to 10 years (proper storage)
Approx. weight	~6 g

When to choose the CR2450

• Use for key fobs, sensors, wearables, medical meters, bike computers, and memory backup that draw low to moderate current over long periods.
• Choose over CR2032/CR2430 when you need longer runtime or slightly higher pulse performance in the same voltage class.
• Avoid if your device only accepts thinner cells (e.g., CR2032 at 3.2 mm or CR2430 at 3.0 mm). Always match the exact size and chemistry your device specifies.

Compatibility and cross‑references

CR2450 is the IEC size code. Common equivalents include DL2450 (Duracell) and ECR2450 (Energizer). Match these criteria before substituting:

• Size: 24.5 × 5.0 mm
• Chemistry: 3V Li/MnO2 (primary)
• Polarity: positive on the flat side, negative on the case rim

Not interchangeable with thinner or thicker cells (CR2032, CR2025, CR2430, CR2477). Do not replace with rechargeable LiR2450 (higher voltage profile) unless your device explicitly supports it. For high‑temperature stability with lower current, some devices specify BR2450 (Li/CFx); follow the device label.

Expected runtime (rule‑of‑thumb)

Actual life varies with load, temperature, and pulse demands. Use these rough estimates for planning:

Average load	Example device	Approx. runtime
10 µA	Idle sensor, clock backup	5–7 years (limited by shelf life)
100 µA	BLE beacon, remote sensor	~8–9 months
1 mA	LED fob (intermittent)	~3–4 weeks equivalent continuous

Short pulses of ~10–15 mA are typical for fresh cells; if your device transmits in bursts, adding a small capacitor across the supply can improve stability.

Installation and care

• Confirm size and orientation: Check your device marking; insert with the + side as indicated.
• Clean contacts: Oil or debris can reduce performance—handle by the edges and avoid touching the faces.
• Storage: Keep spares in a cool, dry place, in original packaging; avoid heat and humidity.
• Do not recharge, short, or mix cells: Never recharge primary coin cells; replace all cells in a set at the same time.
• Temperature: Expect reduced capacity in cold; warm to room temperature before critical use.

Safety and disposal

• Child safety: Coin cells are an ingestion hazard. Keep out of reach; if swallowed, seek immediate medical help or call Poison Control.
• Fire/heat: Do not crush, incinerate, or expose to high temperatures.
• Disposal: Tape terminals and recycle at a battery drop‑off. Do not throw in household trash where prohibited.

FAQ

Can I use a CR2032 instead of a CR2450?

No. CR2032 is thinner and lower capacity. Even if it fits loosely, it may not make proper contact or meet runtime/pulse needs. Use the size specified by the device.

How long will a CR2450 last in a key fob?

Typically 1–3 years, depending on usage (button presses, proximity features) and temperature. Heavy use or extreme cold shortens life.

Is CR2450 rechargeable?

No. It is a primary lithium cell. Do not attempt to recharge. Rechargeable “LiR2450” cells have different voltage behavior and are only for devices designed for them.

What are good alternatives if I need even more runtime?

If space allows and the device supports it, CR2477 offers higher capacity. Otherwise, consider reducing transmit intervals or adding a supercapacitor for pulse loads.

Does cold weather affect performance?

Yes. Capacity and pulse current drop in cold conditions. Keep spares at room temperature and allow the device to warm when possible.