Renata CR1225 (Lithium Coin)

Renata CR1225 3V Lithium Coin Cell

The Renata CR1225 is a compact lithium manganese dioxide (Li‑MnO₂) coin battery designed for low to moderate pulse loads in small electronics. It offers stable 3V output, dependable shelf life, and a size profile of 12.0 mm diameter by 2.5 mm height.

Key Specifications

Chemistry	Lithium Manganese Dioxide (Li‑MnO₂)
Nominal Voltage	3V
Size (D × H)	12.0 × 2.5 mm
Typical Capacity	~45–50 mAh (at low drain)
Operating Temperature	−30°C to +60°C
Shelf Life	Up to 5–10 years (cool, dry storage)
Self‑Discharge	Typically <1–2% per year
Compliance	Mercury‑free, RoHS compliant

When to Choose This Cell

• Use if your device specifically calls for CR1225.
• Good fit for low‑drain or intermittently pulsed devices (e.g., key fobs, sensors, RTC backup).
• Prefer over CR1220 when you need longer runtime in the same 12 mm diameter and your device accepts 2.5 mm height.

When to Avoid

• If the device requires a rechargeable cell (e.g., LIR1225) — the CR1225 is not rechargeable.
• If your device demands higher continuous current than coin cells typically supply — consider a larger coin cell (e.g., CR2032) or a different battery format.
• If your battery compartment is designed for CR1220 (2.0 mm height) — a CR1225 may not fit.

Estimated Runtime Examples

Actual runtime varies by load, pulse profile, and temperature. These quick estimates assume ~48 mAh usable capacity:

• Real‑time clock at 1 µA: ~5.5 years
• Sensor/standby at 10 µA: ~0.55 years (~200 days)
• Wearable standby at 50 µA: ~40 days
• Calculator at 100 µA: ~20 days
• Key fob: multi‑year service under light use (short current pulses, minimal standby draw)

Common Applications

• Key fobs and remote entry
• Wearables and heart‑rate monitors
• Calculators and small electronics
• Memory/RTC backup in devices and modules
• Compact sensors and trackers

Installation and Handling

• Verify the size and type: CR1225 (12.0 × 2.5 mm, 3V, Li‑MnO₂).
• Observe polarity: the “+” side usually faces up.
• Avoid short circuits — do not bridge the top and bottom surfaces with tools.
• Clean contacts if corroded; ensure a snug fit in the holder.
• Do not mix old and new cells or different brands/types in the same device.

Compatibility and Equivalents

• Cross‑references: CR1225, ECR1225 (brand naming may vary).
• Not size‑compatible with CR1220 (thinner) or CR2032 (larger diameter).
• Match by code and dimensions printed in your device manual or on the original cell.

Pros and Cons

• Pros: compact size, stable 3V output, low self‑discharge, wide temperature range, mercury‑free.
• Cons: lower capacity than larger cells like CR2016/CR2025/CR2032; not rechargeable; limited for high continuous current loads.

Storage and Safety

• Store in original packaging in a cool, dry place; avoid heat and direct sunlight.
• Keep out of reach of children and pets — coin cell ingestion is a serious hazard. Seek immediate medical attention if swallowed.
• Do not recharge, crush, disassemble, or incinerate.
• Recycle or dispose per local regulations for lithium batteries.

FAQ

Is CR1225 the same as ECR1225?

They refer to the same size and voltage. Some brands use an “E” prefix (e.g., ECR1225) for their lithium coin cells. Always confirm the 12.0 × 2.5 mm size and 3V rating.

Can I use a CR1220 instead of a CR1225?

No. Although the diameter is the same, the CR1220 is thinner (2.0 mm). It may not make reliable contact or provide the same runtime. Use the size specified by your device.

Is the CR1225 rechargeable?

No. The CR1225 is a primary (single‑use) lithium cell. If your device requires a rechargeable cell, look for a compatible rechargeable chemistry and size specified by the manufacturer.

How long will a CR1225 last in storage?

Stored properly at room temperature in unopened packaging, a CR1225 typically retains usable capacity for 5–10 years with very low self‑discharge.

What temperature range can it handle?

Typical operating range is −30°C to +60°C. Extreme temperatures can reduce available capacity and affect performance.