What Is CR1220 Battery? Specifications, Equivalent Models & Solder Tab Version Selection Guide

If you own slim car key fobs, digital calipers, mini medical detectors or ultra-thin wearable sensors, you have likely seen the small circular CR1220 coin battery inside. Many buyers, electronics engineers and end users feel confused about its basic definition, standard parameters, interchangeable alternatives and customized solder tab batteries. This article systematically sorts out all core information of CR1220, helping you quickly confirm matching specifications, pick correct replacement cells and select suitable welded versions for PCB mounting applications.

1. Basic Definition of CR1220 Lithium Coin Cell

CR1220 belongs to the Li-Manganese Dioxide (Li-MnO₂) primary coin battery series, following unified IEC international naming standards for button cells.

The prefix “CR” stands for 3V disposable lithium manganese coin battery, featuring stable open-circuit voltage, low self-discharge and long storage life.

The first two digits “12” represent the battery’s nominal outer diameter: 12.0 mm.

The last two digits “20” stand for the battery’s nominal thickness: 2.0 mm.

It is an ultra-thin miniature power source different from mainstream large-size CR2025 and CR2032 cells. Designed for micro low-power equipment, it cannot be recharged, and relies on sealed stainless steel casing to prevent electrolyte leakage during long-term standby.

2. Complete Standard Specifications of CR1220

All certified CR1220 batteries comply with unified industry technical specifications, which are the core basis for device matching:

Electrical Parameters

Nominal Voltage: 3.0 V

Typical Rated Capacity: 40 mAh (test condition: 23°C, constant discharge current 0.1mA, cut-off voltage 2.0V)

Max Instant Pulse Discharge Current: 10 mA (only for short burst power supply, not for continuous high-current load)

Standard Static Operating Current: 0.01 mA ~ 0.5 mA, ideal for long standby scenarios

Self-discharge Rate: Less than 1% capacity loss per year at room temperature; up to 10 years shelf life

Battery Type: Non-rechargeable primary lithium battery

Physical & Environmental Parameters

Dimension: Φ12.0 mm × 2.0 mm

Operating Temperature Range: -20°C ~ +60°C

Storage Temperature Range: -30°C ~ +45°C

Shell Material: Anti-corrosion stainless steel, fully sealed anti-leakage structure

3. Universal Equivalent & Interchangeable Models

When replacing batteries for consumer equipment, many brand variants can directly substitute CR1220 without modifying the battery compartment. Their size, voltage and discharge performance are fully consistent.

Full Compatible Equivalent Models

DL1220, ECR1220, KCR1220, L1220

These models adopt identical lithium manganese chemistry and standard dimensions, suitable for car keys, measuring tools and daily small electronics with zero compatibility risk.

Conditionally Compatible Model: BR1220

BR1220 uses carbon fluoride material with slightly different discharge curves. It can only be used for simple low-power devices without strict voltage stability requirements, and is not recommended for precision instruments or automotive electronics.

Forbidden Replacement Reminder

Never replace CR1220 with CR1216, CR2025, CR2032 or other coin cells. Different diameters or thicknesses will cause poor contact, failed installation, or burn out circuits due to mismatched internal space.

4. Solder Tab CR1220 Selection Guide

Standard bare CR1220 cells are only for replaceable battery holders. For industrial equipment, PCB circuit boards and fixed built-in modules, solder tab CR1220 is the mainstream customized solution. Below is a clear selection guide for different tab styles:

4.1 Common Solder Tab Types

Vertical Straight Tabs

Positive and negative metal tabs extend vertically from two sides of the battery, convenient for vertical welding on single-layer PCB boards, widely used in electronic shelf labels and small sensors.

Horizontal L-shaped Tabs

Tabs bend 90 degrees to fit flat horizontal circuit boards, save vertical space, perfect for ultra-thin wearable devices and mini timing modules.

Dual-side Flat Patch Tabs

Low-profile flat tabs without vertical protrusions, ideal for ultra-slim equipment with strict height limit requirements.

4.2 Key Selection Standards

Tab Material: Nickel-plated steel tabs are standard for good solderability and anti-rust performance; customized pure nickel tabs are available for high-end long-life equipment.

Tab Size & Position: Custom tab length, width and spacing according to PCB pad layout to avoid misalignment during mass welding.

High-temperature Grade Customization: CR1220H with high-temperature resistant tabs for automotive electronic modules working under +60°C persistent environment.

Safety Requirement: All welded cells must pass UN38.3 transportation certification and MSDS testing for cross-border export.

4.3 Application Scenarios of Solder Tab CR1220

Industrial IoT: Ultra-thin electronic price tags, temperature & humidity transmitters

Automotive Electronics: Built-in TPMS sensor power, vehicle control standby chips

Medical Devices: Portable mini detection equipment with fixed internal power supply

Smart Wearables: Slim watch timing chips, miniature health monitoring sensors

5. Main Application Scenarios of Standard CR1220

Automotive: Remote car key fobs, tire pressure monitoring auxiliary power

Precision Measuring Tools: Digital calipers, micrometers, portable electronic gauges

Consumer Electronics: Slim digital watches, mini calculators, pocket LED indicators

Medical Supplies: Portable blood glucose meters, electronic thermometers

Industrial Low-power Equipment: Small timing modules, wireless micro sensors

6. Important Usage & Selection Notes

CR1220 cannot be charged, short-circuited, disassembled or thrown into fire to prevent swelling, leakage and safety hazards.

Do not mix new and old batteries or different model coin cells, inconsistent discharge parameters will damage precision circuits.

For mass industrial procurement, confirm whether standard bare cells or customized solder tab versions are required, and specify tab shape and size in advance.

For export orders, select CR1220 with complete UN38.3, MSDS and relevant safety certificates to clear customs smoothly.

Long-term storage environment should be dry, cool and ventilated, avoid direct sunlight and high temperature to slow down self-discharge.

Conclusion

CR1220 is an ultra-thin 3V lithium manganese primary coin cell sized 12.0mm × 2.0mm, featuring low self-discharge and wide temperature adaptability. After learning its standard specifications, fully interchangeable equivalent models and differentiated solder tab selection rules, users can accurately match batteries for daily replacement, consumer product design and industrial PCB fixed power supply. Choosing the right CR1220 variant effectively avoids compatibility failures, prolongs equipment service life and reduces after-sales maintenance costs.