IFR26650LT4.0Ah — Industry-leading 26650 LiFePO₄ with verified −40°C performance
Dongguan, China — October 24, 2025 — Wiltson Energy’s IFR26650LT4.0Ah is a 26650-size LiFePO₄ cylindrical cell designed to deliver both high per-cell energy (4,000 mAh) and proven low-temperature discharge capability down to −40°C. Unlike many 26650-format cells that trade capacity for power, the IFR26650LT4.0Ah combines industry-leading nominal capacity with verified cold-climate endurance — making it an attractive choice for outdoor equipment, cold-region EV subsystems, industrial tools, and energy storage systems.
Why capacity matters in cold environments
In real-world low-temperature deployments, the usable energy that a system can draw from each cell determines runtime, heater/thermal management needs, and total system cost. The IFR26650LT4.0Ah’s 4000 mAh nominal capacity together with a verified ≥90% discharge retention at −40°C (1C test) means more usable watt-hours per cell at operating temperature, which can reduce the number of cells, lower pack weight, or extend runtime compared with many power-focused 26650 alternatives.
Comparison (Representative Market Examples)
| Manufacturer / Model | Nominal Capacity (mAh) | Low-temp Discharge Spec | Low-temp Retention (%) | Typical Strength |
|---|---|---|---|---|
| Wiltson — IFR26650LT4.0Ah | 4000 | −40°C (1C test) | 90 | High per-cell energy + verified −40°C retention. |
| A123 (Nanophosphate 26650 example) | 2600 | −30°C (typical) | 80 | Very high power and cycle life; lower capacity. |
| Generic 26650-4000 (various OEMs) | 4000 | often unspecified / −20~−30°C | 75 | High nominal capacity on paper, but low-temp guarantees vary. |
| High-power 26650 (performance-focused) | 2500 | −30°C (typical) | 78 | Optimised for very low internal resistance and high discharge currents. |
Technical Highlights
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True 4000 mAh nominal capacity (min 3950 mAh).
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Verified −40°C discharge capability — ≥90% retention at 1C under specified test conditions.
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Designed for long service life — engineered for extended cycles in fielded systems.
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High pack flexibility — suitable for OEM pack design, modules and energy storage systems.
Engineering Note
Compared with power-optimised 26650 cells (2.4–2.6 Ah), IFR26650LT4.0Ah delivers up to ~50–70% more per-cell energy while retaining robust low-temperature performance — a direct system-level advantage in cold-climate applications.
(Representative comparison based on public product categories and Wiltson specifications.)