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IFR18650 / LiFePO₄ | 3.2V Batteries – Ultra-Safe, Long-Life Lithium Iron Phosphate Cells
Welcome to our IFR18650 / LiFePO₄ (3.2V) collection. The IFR18650 is the Lithium Iron Phosphate (LiFePO₄) variant of the widely adopted 18650 cylindrical format. It trades slightly lower energy density for unmatched safety characteristics and exceptional cycle life. With a nominal voltage of 3.2V (fully charged at 3.65V) and a typical capacity range of 1100mAh to 1600mAh, these cells are rated for 2,000 to 5,000+ full charge/discharge cycles. IFR18650 batteries are the definitive choice for solar energy storage, medical equipment, UPS backup systems, emergency lighting, and any application where safety and total cost of ownership take precedence over maximum energy density.
Core Advantages
- Inherently Safe – No Thermal Runaway: LiFePO₄ is the most thermally stable lithium-ion cathode material available. It passes nail penetration, overcharge, crush, and short-circuit tests without catching fire or exploding, making it the safest choice for indoor, personal, or unattended installations.
- Ultra-Long Cycle Life: Rated for 2,000–5,000+ full cycles (≥80% capacity retention). This translates to a service life 3 to 10 times longer than standard NMC 18650 cells, dramatically reducing lifetime replacement costs in stationary storage applications.
- Flat Discharge Curve: Maintains a consistent 3.2V output throughout the majority of the discharge cycle, delivering stable voltage to your device until near-full depletion.
- Wide Operating Temperature: Performs reliably from -20°C to 60°C during discharge, with excellent high-temperature tolerance unmatched by standard Li-ion. Charging range: 0°C to 45°C (select cells support -10°C charging).
- Low Self-Discharge: Loses only 2–3% charge per month in storage, making IFR18650 ideal for emergency backup equipment and seasonal-use devices.
- Environmentally Friendly: Contains no cobalt and no toxic heavy metals. LiFePO₄ is one of the most sustainable lithium-ion chemistries available.
IFR18650 vs. Standard 3.7V Li-ion (NMC/NCA)
| Parameter | IFR18650 (LiFePO₄) | Standard 18650 (NMC/NCA) |
|---|---|---|
| Nominal Voltage | 3.2V | 3.6V–3.7V |
| Full Charge Voltage | 3.65V ±0.05V | 4.20V ±0.05V |
| Discharge Cut-off | 2.0V–2.5V (2.5V recommended) | 2.5V–3.0V |
| Typical Capacity | 1100mAh – 1600mAh | 2000mAh – 3500mAh |
| Cycle Life | 2,000–5,000+ cycles | 500–1,000 cycles |
| Energy Density | 90–120 Wh/kg | 200–260 Wh/kg |
| Safety Profile | Excellent (no thermal runaway) | Good (requires protection circuit) |
| Ideal Application | Stationary storage, safety-critical | Portable high-power / high-capacity |
Typical Specifications (IFR18650)
| Specification | Typical Values |
|---|---|
| Nominal Voltage | 3.2V |
| Full Charge Voltage | 3.65V ±0.05V |
| Discharge Cut-off Voltage | 2.5V (recommended) |
| Capacity Range | 1100mAh – 1600mAh |
| Continuous Discharge Current | 3A – 10A (grade dependent) |
| Max Pulse Discharge Current | 10A – 20A |
| Cycle Life (to 80% capacity) | 2,000 – 5,000 cycles |
| Operating Temperature | Charge: 0°C~45°C / Discharge: -20°C~60°C |
| Internal Resistance | ≤50mΩ (typically 20–40mΩ) |
| Cell Weight | Approx. 40–45g |
Typical Applications
| Application | Why IFR18650 / LiFePO₄ |
|---|---|
| Solar Energy Storage / Off-Grid Systems | 5,000+ cycle life meets daily cycling; thermal safety for indoor/outdoor installs |
| UPS / Backup Power Systems | Long standby life, stable voltage, safe for unattended operation |
| Medical Devices (Monitors, Infusion Pumps) | No fire/explosion risk; extended service intervals reduce maintenance |
| Emergency Lighting / Exit Signs | Wide temperature tolerance; reliable after years of float charging |
| Security Systems / Remote Sensors | Low self-discharge; safe for long-term, unsupervised deployment |
| DIY Powerwalls / Home Energy Storage | Easy series/parallel configuration; inherently safe chemistry |
| Mobility Scooters / Electric Wheelchairs | Safe around users; excellent deep-cycle endurance |
| RC Models (LiFePO₄-Ready) | Safer alternative to LiPo; flat discharge for consistent throttle response |
⚠️ Critical Compatibility Warning – Not Interchangeable with 3.7V Cells
IFR18650 LiFePO₄ cells are NOT drop-in replacements for standard 3.7V Li-ion batteries.
- Voltage Mismatch: The nominal 3.2V and full charge 3.65V differ significantly from the 3.7V/4.2V of standard cells. Devices designed for 3.7V will likely shut down prematurely or operate incorrectly.
- Charger Requirement: Use ONLY a LiFePO₄-specific charger with a 3.65V cut-off voltage. Charging an IFR cell with a standard 4.2V Li-ion charger will cause irreversible overcharge damage and poses a safety hazard.
- Device Compatibility: Ensure your device is explicitly rated for or configurable to 3.2V LiFePO₄ chemistry. Many flashlights, medical instruments, and industrial controllers offer this option.
For devices requiring 3.7V operation, please refer to our High Drain or High Capacity 18650 collections.
Why Choose Our IFR18650 / LiFePO₄ Batteries?
- Genuine Grade-A Cells: Sourced from reputable LiFePO₄ manufacturers with full traceability. No recycled or B-stock cells.
- Verified Performance: Every batch is tested for actual capacity, internal resistance, and cycle retention. No exaggerated ratings.
- Protected & Unprotected Options: Choose raw cells for professional pack assembly, or protected button top cells with integrated PCM for consumer safety.
- Precision Cell Matching: Capacity and voltage matching services available for multi-cell series packs (2S, 4S, 8S, etc.) to ensure pack consistency.
- Flexible Quantities: Single-cell retail, multi-packs, and wholesale bulk pricing available.
- Certified & Documented: CE, RoHS, UN38.3 certified. MSDS and full export documentation provided.
- Technical Support: Expert guidance on LiFePO₄ system design, BMS selection, and charger compatibility.
👇👇👇 Browse the product list below to select the right IFR18650 / LiFePO₄ cell for your safety-critical, long-life application. For custom battery pack assembly or volume pricing, contact our engineering support team.
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