Maxell CR1220 3V Lithium Coin Cell

The Maxell CR1220 is a compact 3V lithium coin cell designed for space-limited, low-drain electronics. Its 12 mm diameter and 2.0 mm height deliver around 35 mAh of capacity—ideal for slim watches, calculators, small sensors, and memory/RTC backup circuits.

At a Glance

• Size: 12 mm diameter × 2.0 mm height (IEC: CR1220)
• Nominal voltage: 3 V
• Typical capacity: ~35 mAh (at low drain)
• Chemistry: Lithium manganese dioxide (Li-MnO2)
• Operating temperature: -4 to 140°F (-20 to +60°C)

When to Choose CR1220

• Use if your device explicitly specifies CR1220 or 12 × 2.0 mm coin cell.
• Best for low-drain, intermittent loads (watches, calculators, memory backup, slim sensors).
• Avoid for high-drain devices (bright LEDs, wireless trackers) or any application requiring a rechargeable cell—CR1220 is not rechargeable.

Compatibility and Equivalents

Direct replacements across brands include CR1220, DL1220 (Duracell), and ECR1220 (Energizer). Thickness matters for fit and contact pressure:

• CR1216: 12 × 1.6 mm, ~25 mAh — thinner; use only if your device accepts it.
• CR1220: 12 × 2.0 mm, ~35 mAh — specified size for most devices calling for CR1220.
• CR1225: 12 × 2.5 mm, ~50 mAh — thicker; do not force into a 1220 compartment.

BR1220 (poly-carbon monofluoride) cells can substitute in some low, steady-drain uses and offer good high-temperature stability, but may deliver weaker pulse performance than CR chemistry.

Typical Use Cases and Rough Runtime

• Quartz watch (≈1–3 µA): about 1–3 years.
• Calculator or small sensor (≈5–20 µA with occasional pulses): several months to 1+ year.
• Memory/RTC backup (microamp-level standby): multi-year retention; confirm with device specs.

Actual life depends on current draw, temperature, and duty cycle. Check your device manual for expected consumption.

Installation

1. Power off the device if possible.
2. Open the battery compartment carefully to avoid bending contacts.
3. Note polarity: the marked face is positive (+).
4. Insert the new cell with correct orientation and ensure solid contact.
5. Close the compartment securely and test the device.

Storage and Recycling

• Store in original packaging at room temperature in a dry place.
• Keep cells separate to prevent short circuits; do not carry loose with keys or coins.
• Recycle at approved battery collection points; do not dispose in household trash.

Safety Notes

• Coin cells are a choking and ingestion hazard. Keep away from children and pets.
• If swallowed, seek immediate medical attention. Tape used cells on both sides before disposal to reduce ingestion and shorting risk.
• Do not recharge, disassemble, puncture, or expose to heat or fire.

CR1220 vs. Nearby Sizes

Type	Size (mm)	Typical Capacity	Notes
CR1216	12 × 1.6	~25 mAh	Thinner; fits only if contacts support 1.6 mm height.
CR1220	12 × 2.0	~35 mAh	Balanced thickness/capacity for slim devices.
CR1225	12 × 2.5	~50 mAh	Thicker; use only if the compartment allows 2.5 mm.

FAQ

Is CR1220 the same as DL1220 or ECR1220?

Yes. These are brand-specific names for the same 12 × 2.0 mm, 3V lithium coin cell.

Can I use a CR1225 instead of a CR1220?

Only if your device supports the thicker 2.5 mm battery. Never force a thicker cell—it can damage contacts or the enclosure.

What affects runtime the most?

Current draw, temperature, and pulse intensity. Low, steady loads at room temperature yield the longest life.

Does polarity matter?

Yes. Install with the positive (+) side aligned to the device marking. Reversed polarity can prevent operation or cause damage.

Is BR1220 an acceptable substitute?

Sometimes. BR1220 suits very low, steady drain and wider temperature ranges but may underperform on pulse loads compared with CR1220.