Renata CR2032 (Lithium Coin)

Renata CR2032 3V Lithium Coin Cell

The Renata CR2032 is a primary (non-rechargeable) lithium manganese dioxide coin cell that powers small electronics requiring reliable 3 V with long shelf life. Its 20 mm diameter and 3.2 mm height fit devices explicitly marked for CR2032.

Key Specifications

Size	CR2032 (20 x 3.2 mm)
Chemistry	Lithium manganese dioxide (Li‑MnO2)
Nominal voltage	3.0 V
Typical capacity	~220–240 mAh (low-drain to 2.0 V cutoff)
Recommended load profile	Best for microamp to low‑milliamp continuous draw with short pulse currents common to remotes and sensors
Operating temperature	−22 to 140 °F (−30 to +60 °C)
Self‑discharge	Low (often ~1–2% per year in storage)
Shelf life (sealed)	Up to 8–10 years when stored cool and dry
Compliance	Mercury‑free; RoHS compliant

When to Choose This Battery

• Use if: Your device specifies CR2032; you want longer runtime than thinner cells (CR2025/CR2016); the device draws low or intermittent current (key fobs, sensors, watches, motherboards).
• Avoid if: The device requires a rechargeable coin cell (LIR2032/ML2032) or sustained higher current draw (e.g., bright LEDs or trackers with frequent transmissions). A CR2032 should not be recharged or used as a power source for continuous high loads.

Typical Applications

• Car key fobs and remote controls
• Glucose meters and small medical sensors (confirm with device manual)
• Watches, fitness trackers, and bike computers
• Computer motherboards (CMOS/RTC backup)
• Smart sensors, scales, and small security devices

Runtime Examples (Approximate)

Device	Typical use	Expected life
Car key fob	Short RF pulses, infrequent	1–3 years
Motherboard CMOS/RTC	Very low, continuous	3–7 years
Glucose meter	Daily readings	6–12 months
LED tealight	Continuous	60–120 hours

Actual life varies with device design, temperature, pulse current, and duty cycle.

Compatibility and Alternatives

• Equivalent designations: CR2032 (IEC). Brand codes like DL2032 or ECR2032 are the same size and chemistry.
• CR2025 / CR2016: Thinner options with less capacity. They may fit but can lose contact in holders designed for 3.2 mm thickness and will run shorter.
• Rechargeable look‑alikes: LIR2032 (Li‑ion ~3.6–3.7 V) and ML2032 (rechargeable Li‑MnO2) are not drop‑in replacements. Use only if your device explicitly supports them.
• BR2032 (Li‑CFx): Some devices specify BR2032 for better high‑temperature stability; do not substitute unless allowed by the device.

Installation Tips

1. Confirm the device specifies CR2032 and note polarity (+ usually faces up).
2. Power off the device if possible. Eject the old cell carefully using a non‑metal tool.
3. Clean contacts with a lint‑free swab lightly moistened with isopropyl alcohol; let dry.
4. Handle the new cell by the edges to avoid skin oils on the contacts.
5. Replace all cells together in multi‑cell devices; do not mix old and new.

Storage and Handling

• Store in the original packaging in a cool, dry place; avoid heat and humidity.
• Check the expiration date before installation for best performance.
• Some devices require cells without a child‑deterrent bitter coating; if your device warns about coated cells, choose an uncoated CR2032.

Safety and Disposal

• Button/coin cells are a severe ingestion hazard. Keep away from children and pets. If swallowed, seek immediate medical attention.
• Do not recharge, short, crush, puncture, or incinerate. Never stack cells to increase voltage in a device not designed for it.
• Tape terminals of spent cells to prevent shorting and recycle at approved collection points. Do not dispose of in household trash where prohibited.

FAQ

Is the Renata CR2032 rechargeable?

No. It is a primary lithium cell and must not be recharged. Use ML2032 or LIR2032 only if your device specifies rechargeables.

Can I use a CR2025 or CR2016 instead?

Only if the device allows it. They are thinner and hold less energy, and may not make reliable contact in holders designed for 3.2 mm thickness.

What voltage should I see on a new CR2032?

Typically around 3.0–3.2 V open‑circuit. Under load, voltage will drop based on current draw and cell state.

Why does my device not power on with a brand‑new cell?

Check polarity, contact cleanliness, and whether the device requires uncoated cells. Also ensure the holder applies firm pressure for good contact.

Will very cold or hot temperatures affect runtime?

Yes. Capacity drops at low temperatures, and high heat accelerates self‑discharge. Keep within the rated −22 to 140 °F (−30 to +60 °C) range for best results.