Key takeaways:
- Match the CR1220’s 3.0V voltage and 12.5×2.0mm size exactly when choosing an equivalent, so the cell fits properly and your device works as designed.
- For direct replacements, use CR1220 lithium coin cells from trusted brands such as Panasonic, Duracell, Energizer, or Maxell to ensure stable performance and long shelf life.
- BR1220 has the same size and 3V rating and can be used as a non‑rechargeable alternative when ultra‑low self‑discharge and long storage life are required.
- Avoid CR1225 or CR1216 unless your device manual clearly allows 1.6–2.5mm thickness; wrong thickness can cause poor contact, housing damage, or intermittent power.
- Never replace a CR1220 with LIR1220 or AG‑series alkaline button cells, as their different voltage and chemistry can lead to malfunction, data loss, leakage, or permanent damage.
Top CR1220 Battery Equivalent Models by Brand
The following table compares major brands’ CR1220 models and their closest equivalents, including real-world capacity, typical discharge curves, and shelf life data based on published manufacturer specifications and independent testing:
|
Brand
|
Model
|
Voltage
|
Capacity (mAh)
|
Thickness (mm)
|
Shelf Life
|
Replacement type
|
|
Panasonic
|
CR1220
|
3V
|
35–40
|
2.0
|
10 years
|
Direct CR1220 equivalent
|
|
Duracell
|
CR1220
|
3V
|
36
|
2.0
|
10 years
|
Direct CR1220 equivalent
|
|
Energizer
|
CR1220
|
3V
|
35
|
2.0
|
10 years
|
Direct CR1220 equivalent
|
|
Maxell
|
CR1220
|
3V
|
38
|
2.0
|
10 years
|
Direct CR1220 equivalent
|
|
Panasonic
|
BR1220
|
3V
|
35
|
2.0
|
15 years
|
Size‑equivalent alternative (Li‑C)
|
|
Renata
|
CR1225
|
3V
|
45–50
|
2.5
|
10 years
|
Conditional only (thicker)
|
|
Energizer
|
CR1216
|
3V
|
28–30
|
1.6
|
10 years
|
Conditional only (thinner)
|
For direct replacement, stick with CR1220 from Panasonic, Duracell, or Maxell. The BR1220 is the closest equivalent in size and voltage but is a different chemistry (Li-C vs Li-Mn). Avoid CR1225 and CR1216 unless your device explicitly tolerates ±0.5mm thickness.
This button battery conversion chart is essential for procurement engineers and IoT designers who need precise replacement for cr1220 battery options without risking equipment failure.
Understanding CR1220 Battery Size and Specifications
The CR1220 is a standardized 3V non-rechargeable lithium-manganese dioxide (Li-MnO₂) button cell defined by the IEC 60086 standard. Its critical physical parameters are:
-
Diameter: 12.5 mm (±0.1 mm)
-
Thickness: 2.0 mm (±0.1 mm)
-
Nominal Voltage: 3.0 V
-
Typical Capacity: 35–40 mAh
-
Chemistry: Lithium (anode) + Manganese Dioxide (cathode)
-
Self-Discharge Rate: <1% per year at 20°C
The “CR” designation in IEC terminology means:
-
C: Lithium chemistry with 3V nominal voltage
-
R: Round (button) shape
The “1220” encodes size: 12 = 12 mm diameter (rounded), 20 = 2.0 mm thickness.
Why can’t you substitute a 1.5V alkaline or a 3.7V rechargeable cell? Because most CR1220-powered circuits are designed for a strict 3.0V ±0.3V window. Deviations beyond this can cause:
-
Undervoltage lockout (if <2.7V)
-
Overvoltage damage to RTC or CMOS (if >3.3V)
-
Physical misfit leading to contact failure
This is not a suggestion—it’s a hard electrical constraint derived from the device’s power management IC specifications.
Can You Use CR1225 or CR1216 Instead
Technically, CR1225 (2.5mm thick) and CR1216 (1.6mm thick) share the same 12.5mm diameter and 3V voltage, but their thickness deviation of ±0.4–0.5mm creates severe mechanical risks in compact slots:
| Risk | CR1225 (+0.5mm) | CR1216 (-0.4mm) |
| Spring deformation | Forceful compression may bend contact spring | Spring may not reach battery |
| Housing cracking | Excessive pressure can crack plastic housing | No risk |
| Contact resistance | May improve initially, then fail under vibration | High resistance due to loose fit |
| Device failure | Possible short if spring deforms permanently | Intermittent power, data loss |
In automotive key fobs, IoT sensors, and motherboard CMOS backup circuits, the battery slot is often <2.2mm deep. Installing a CR1225 can permanently deform the contact spring, leading to permanent power loss even after removal. Conversely, CR1216 may rattle, causing intermittent power and corrupting RTC time stamps.
Bottom line: Only use CR1225/CR1216 if your device manual explicitly states “tolerates 1.6–2.5mm.” Otherwise, stick to 2.0mm.
Dangerous Differences Between CR1220 and LIR1220 Batteries
This is the most critical warning in this guide: CR1220 and LIR1220 are NOT interchangeable.
| Parameter | CR1220 | LIR1220 |
| Voltage | 3.0 V (non-rechargeable) | 3.6–3.7 V (rechargeable) |
| Chemistry | Li-MnO₂ (primary) | Li-ion (secondary) |
| Rechargeable? | No | Yes |
| Max Continuous Current | 10 mA | 50–100 mA |
| Self-Discharge | <1%/year | 2–5%/month |
LIR1220 is a lithium-ion rechargeable cell with a nominal voltage of 3.6–3.7V, which is 20–23% higher than CR1220’s 3.0V.
If you install an LIR1220 in a CR1220-designed circuit:
-
The RTC (Real-Time Clock) circuit on motherboards will instantly overload, often burning the crystal oscillator or PMIC.
-
IoT sensors with low-voltage MOSFETs may experience gate rupture.
-
Automotive key fobs can suffer EEPROM corruption due to voltage spike.
This is not a “maybe”—it’s a documented failure mode in multiple electronics repair case studies. Never use LIR1220 as a replacement for CR1220.
Why AG Alkaline Batter Cannot Replace CR1220
Some users mistakenly try AG series alkaline button cells (e.g., AG13, AG10) as CR1220 replacements. This is a dual failure:
| Factor | CR1220 | AG Alkaline |
| Voltage | 3.0 V | 1.5 V |
| Chemistry | Li-MnO₂ | Zn-MnO₂ (alkaline) |
| Self-Discharge | <1%/year | 10–20%/year |
| Leakage Risk | Near-zero | High (especially after depletion) |
| Capacity | 35–40 mAh | 10–25 mAh (varies by size) |
AG batteries deliver only 1.5V, which is 50% of CR1220’s voltage. Most CR1220 circuits require a minimum of 2.7V to operate. At 1.5V, the device will:
-
Fail to power on
-
Reset continuously
-
Corrupt stored data
Additionally, alkaline chemistry has a high self-discharge rate and is prone to leakage, which can corrode industrial PCBs. One drop of alkaline electrolyte can destroy a $500 sensor module.
Never use AG alkaline as a replacement for CR1220 battery.
Common Devices That Use CR1220 Batteries
The CR1220 is the standard backup cell for:
-
Motherboard CMOS/RTC: Keeps BIOS time and settings when PC is off
-
IoT Sensors: Wireless temperature, humidity, and motion sensors
-
Automotive Key Fobs: Backup power for remote keyless entry
-
Medical Instruments: Glucose meters, pulse oximeters, portable ECG
-
Security Systems: Wireless door/window sensors, keypad backups
-
Smart Watches: Some legacy models use CR1220 for auxiliary power
These applications share a common trait: low-current, long-life, critical backup power. The CR1220’s 35–40 mAh capacity at 3V provides 5–10 years of standby life in CMOS circuits, which is unmatched by alkaline or rechargeable alternatives.
If you’re designing or repairing any of these devices, the replacement for cr1220 battery must match voltage, size, and chemistry exactly.
Where to Buy CR1220 Batteries
where can i buy cr1220 batteries? The answer depends on whether you need consumer-grade retail or industrial-grade bulk.
Retail vs. Industrial Supply
| Factor | Retail (Amazon, Drugstores) | Industrial (Vigor Components) |
| Batch Consistency | Variable | ISO-certified, traceable |
| Shelf Life | Often 2–4 years old | 8–10 years (fresh batches) |
| Quality Control | Minimal | IEC 60086 compliant, tested |
| Bulk Pricing | No | Yes (MOQ 100–10,000+) |
| Lead Time | 1–3 days | 2–5 days global |
| Certification | None | RoHS, REACH, CE |
Why Choose Vigor Components?
Vigor Components PTE LTD is one of the global top electronic component distributors, specializing in high-reliability button cells for critical applications. Our CR1220 inventory includes:
-
Fresh batches with 8–10 year shelf life (not expired retail stock)
-
IEC 60086-certified Panasonic, Maxell, and Duracell models
-
Full traceability with batch numbers and COA (Certificate of Analysis)
-
Bulk pricing for 100–10,000+ units
-
Global shipping to US, EU, Asia, and Australia
References