The LiFePO₄ IFR26650 (4000 mAh) presents itself as a stout cylindrical cell engineered for dependable, long-life energy delivery. Its exterior sleeve is clean and factory-finished, with the standard IFR form factor that signals easy integration into multi-cell packs. Visually the cell reads as utilitarian and robust no unnecessary ornamentation, just a clear indication of manufacturer identity and basic ratings.
Beneath the sleeve is a construction optimized for stable chemistry and mechanical integrity: electrode layers and separators packed to priorities long cycle life and safe thermal behavior. The cell’s proportions and terminal details reflect attention to manufacturing consistency so that each unit stacks, connects and cools predictably inside packs. The overall feel is one of engineered restraint designed to perform reliably rather than to impress.
Functionally, the IFR26650 gives the impression of a workhorse: sized for high-capacity LiFePO₄ applications where safety, wide operating temperature range and cycle life matter. Markings are practical model, nominal voltage and capacity and packaging is industrial, aimed at bulk handling and safe transport. Overall, the cell communicates durability and suitability for repeated, demanding charge/discharge duty.
Features:
- LiFePO₄ chemistry for stable thermal and cycle performance.
- High nominal capacity: 4000 mAh.
- Low max alternating internal resistance (≤ 23 mΩ).
- Wide operating temperature range for discharge (−20 °C to 60 °C).
- Robust charge/discharge capability with high permissible currents (see specs).
- Excellent cycle life (≥ 1500 cycles to 80% capacity under stated test).
- Extensive safety/abuse test performance (no explosion or fire across multiple abuse tests).
Specifications:
| Parameter |
Value / Description |
| Model: |
IFR26650-4000mAh |
| Nominal capacity: |
4000 mAh (0.5C test) |
| Minimum capacity: |
≥ 3900 mAh (0.5C) |
| Nominal voltage: |
3.2 V |
| Charging (cut-off) voltage: |
3.65 ± 0.05 V (CC–CV) |
| Standard charge current: |
0.5C (2000 mA) |
| Max charge current (by temp): |
0–5 °C: 0.2C (800 mA)
5–15 °C: 0.5C (200 mA)
15–55 °C: 1C (4000 mA) |
| Standard discharge current: |
0.5C (2000 mA), cut-off 2.5 ± 0.05 V |
| Max discharge current (by temp): |
−20–5 °C: 0.5C (2000 mA)
5–45 °C: 3C (12,000 mA)
45–60 °C: 1C (4000 mA) |
| Alternating internal resistance (AC): |
≤ 23 mΩ (1 kHz) |
| Cycle life: |
≥ 1500 cycles (0.5C charge / 1C discharge until 80% initial capacity) |
| Dimensions: |
Height ≤ 65.2 mm; Diameter 26.2 ± 0.2 mm |
| Weight: |
≤ 91 g |
| Operating temperature (charge): |
0 to 55 °C |
| Operating temperature (discharge): |
−20 to 60 °C |
| Storage temperature: |
1 month: −20 to 60 °C
3 months: −20 to 40 °C
12 months: −20 to 20 °C |
| Appearance: |
No rupture, scratch, deformation, stain or leakage |
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