LiFePO4 Packs That Charge at -30°C No Heater Required

Our standard MOQ is 50 units for custom battery packs. For evaluation and testing, we offer sample orders of 1–10 units. Contact our team to discuss your specific volume requirements.

Yes. We provide pre-production samples within 7–14 business days. Samples are fully tested to IEC 62133 and UN38.3 standards. NRE fees may apply depending on customization complexity.

Our LiFePO4 battery packs can pass CE, CB, UN38.3, UL1642, REACH, and RoHS certifications. System-level standards such as IEC 62619 and IEC 62620, as well as other market-specific certifications, are available upon request.

Standard lead time is 4–6 weeks after design confirmation and deposit receipt. Rush production (2–3 weeks) is available for select configurations.

Absolutely. We engineer battery packs to your exact voltage (3.2V to 72V+), capacity (1Ah to 500Ah+), form factor, and connector requirements. Our engineering team will review your specs within 24 hours.

Two things happen, and only one of them is reversible. Discharging in the cold raises internal resistance and electrolyte viscosity, so the pack delivers less capacity and sags harder under load; that loss returns once the cell warms up. Charging in the cold is the damaging one: below roughly 0°C, lithium deposits as metal on the anode surface instead of intercalating into it, permanently removing capacity and creating an internal short-circuit risk. That is why nearly every standard pack, LiFePO4 included, ships with a BMS that refuses to charge below freezing.

Yes. LiFePO4 (lithium iron phosphate, or LFP) is one of several lithium-ion chemistries; what differs from the NMC and LCO cells common in consumer electronics is the cathode material, which gives LFP a flatter discharge curve, better thermal stability, and longer cycle life in exchange for some energy density. Every lithium-ion chemistry shares the same cold-charging limitation, so specifying LFP does not by itself make a pack cold-capable. What makes ours cold-capable is the electrolyte formulation, the anode design, and the BMS charge logic, not the cathode.

For charging, 0°C is a hard line on most standard packs: the BMS simply refuses below it. Discharge has no single cutoff, but usable capacity and available current fall away steeply below about -10°C, and at -40°C a standard LFP cell is limited to roughly 0.2C, too little for most motors, compressors, and transmitters. Our LT platform is specified for discharge from -40°C to +60°C at up to 3C and charging from -30°C to +60°C, with at least 90% capacity retention at -40°C measured against 25°C.

Our low-temperature LiFePO4 packs are guaranteed for discharge operation from -40°C to +60°C. Charge operation is supported from -30°C to +60°C. All specifications are verified through environmental chamber testing.

Below freezing, ionic conductivity in a standard electrolyte drops sharply, and lithium ions deposit as metallic lithium on the anode surface instead of intercalating into it — a phenomenon called lithium plating. It permanently reduces capacity and can create internal short-circuit risks, which is why standard packs block charging below 0°C. Our LT cells combine a low-temperature electrolyte with an anti-plating anode design that keeps ions mobile down to -30°C, enabling safe charging without heaters.

Every model ships with a datasheet based on environmental chamber testing — including capacity retention at -20°C and -40°C (≥90% vs. 25°C on our IFR26650LT platform), temperature-compensated charge limits, and cycle-life data (≥80% after 1,500 cycles). We recommend starting with a 1–10 unit sample order for your own chamber validation before scaling to production volumes.

Our LT platform is rated for discharge from -40°C to +60°C and charging from -30°C to +60°C; the underlying LT cell can discharge down to -50°C at reduced current. For sustained operation beyond these limits, talk to our engineering team — options include insulated enclosures, alternative cell chemistries, or hybrid thermal designs matched to your duty cycle.