Renata CR1025 3V Lithium Coin Cell (10 × 2.5 mm)

The Renata CR1025 is a compact 3V lithium coin battery designed for ultra‑small, low‑drain devices where space is tight and reliable standby power matters. It fits holders labeled CR1025 and is ideal for intermittent use patterns such as key fobs, RTC/memory backup, and miniature wearables.

Key specifications

• Chemistry: Lithium Manganese Dioxide (Li‑MnO₂)
• Nominal voltage: 3V
• Capacity (typical): ~30 mAh (effective capacity varies with load and temperature)
• Size: 10 mm diameter × 2.5 mm height (IEC: CR1025)
• Operating temperature: −30°C to +60°C
• Compliance: Mercury‑free, RoHS compliant

When to choose CR1025

• Use if: Your device specifically requires CR1025; space is limited; average current is in the microamp to low‑milliamp range; long standby with occasional pulses.
• Avoid if: Your device draws sustained high current (e.g., frequent wireless transmissions, bright LEDs, buzzers). Consider a larger coin cell (CR1216/CR1220/CR2032 if the holder allows) or a rechargeable pack designed for higher drains.

Approximate runtime (rule of thumb)

Estimates assume ~30 mAh at room temperature with steady loads. Real devices often deliver less due to pulsed demand and cutoff voltage.

Average load	Ballpark runtime
5 µA (sensor/RTC)	6–9 months
20 µA (very low drain)	6–9 weeks
50 µA (low drain)	2–4 weeks
0.2 mA	3–6 days
1 mA	1 day or less

Compatibility and equivalents

• Labeling: CR1025, IEC CR1025 (may appear as CR-1025).
• Not the same as: CR1020, CR1216, CR1220, or CR2032 (different size/holders).
• Other chemistries: BR1025 (poly‑carbon monofluoride) can offer wider temperature stability but lower pulse capability; only use if your device and specifications allow. Rechargeable “LIR1025” cells have higher voltage (up to 4.2V when charged) and are not a safe drop‑in replacement.

Common applications

• Keyless entry and small remote controls
• Miniature calculators and wearables
• Memory/RTC backup in compact electronics
• Small medical/fitness sensors (check OEM specs)

Installation tips

• Verify polarity before insertion (typically “+” on the flat top faces up).
• Use clean, dry hands or non‑metallic tweezers to avoid shorting and contamination.
• Replace all cells in multi‑cell devices at the same time.
• Do not mix new and used cells or different chemistries.

Storage and safety

• Store in original packaging in a cool, dry place; avoid heat and humidity.
• Coin cells are a choking and ingestion hazard. Keep away from children and pets; seek immediate medical attention if swallowed.
• Do not recharge, crush, or short‑circuit. Dispose of in accordance with local battery recycling rules.

Troubleshooting and alternatives

• Device resets or weak output: Check contact tension and cleanliness; verify you’re using the correct size (10 × 2.5 mm).
• Short runtime with bursts: Your load may exceed what CR1025 can comfortably supply. If possible, select a larger cell (e.g., CR1216/CR1220) or redesign for a higher‑drain source.

FAQ

Can I substitute CR1025 with CR1216 or CR1220?

No. Those cells have different diameters/heights and require different holders. Use only the size specified by your device.

What shelf life should I expect?

Typically up to 5–7 years when stored at 20–25°C in original packaging. High heat and humidity reduce shelf life.

Is CR1025 suitable for continuous high‑drain loads?

No. CR1025 is intended for low‑drain or intermittent loads. For higher current, choose a larger primary cell or a rechargeable solution designed for that profile.

Are Renata CR1025 cells interchangeable with other brands’ CR1025?

Yes—CR1025 is an IEC size/chemistry designation. Match the size and chemistry, and follow the device manufacturer’s recommendations.

Which side is positive?

The flat top is the positive “+” side; the bottom/edge is negative “−”. The holder usually marks the required orientation.