Product Overview
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| The ATOMFAIR® 26650 Low-Temperature LFP (LiFePO4) cylindrical cell is engineered for extreme cold-weather energy storage applications. With a nominal capacity of 3500mAh and the unique ability to charge and discharge at temperatures as low as -20°C without external heating, this cell eliminates the need for battery warmers in winter environments. Offering high energy density (128Wh/kg), military-grade reliability, and civilian-friendly pricing, it is the ideal choice for off-grid solar storage, EV auxiliary batteries, cold-region telecom backup, and polar research equipment. |
Technical Specifications
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| PARAMETER |
VALUE |
| General Parameters |
| Nominal Capacity (0.2C) |
3500 mAh |
| Minimum Capacity (0.2C) |
3450 mAh |
| Nominal Voltage |
3.2 V |
| Energy Density |
128 Wh/kg |
| Internal Resistance |
≤25 mΩ |
| Weight |
≈87 g |
| Cycle Life (80% DOD, 25°C) |
1500 cycles |
| Charge Parameters |
| Max. Charge Voltage |
3.65 ± 0.03 V |
| Standard Charge Current |
0.5C |
| Max. Charge Current |
1.0C @ T>0°C; 0.5C @ T≤0°C; 0.2C @ T≤-10°C |
| Discharge Parameters |
| Min. Discharge Voltage |
2.00 V @ T > -20°C; 1.50 V @ T ≤ -20°C |
| Standard Discharge Current |
0.5C |
| Max. Continuous Discharge Current |
1.0C (module level) |
| Discharge Performance |
>70% @ -40°C to 1.5V; >75% @ -20°C to 1.5V; >98% @ 60°C to 1.5V |
| Temperature Ranges |
| Charge Temperature |
-20°C to 55°C |
| Discharge Temperature |
-40°C to 60°C |
| Manufacturing Compliance: Fully traceable production under ISO 9001:2025 and IATF 16949 standards. Custom form factors or electrode formulations available upon request. |
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Key Features & Advantages
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- Direct Charge & Discharge at Sub-Zero Temperatures: No pre-heating required — capable of charging at temperatures as low as -20°C.
- Excellent Low-Temperature Power Output: Supports continuous 1C discharge below 0°C with >90% discharge efficiency.
- High Energy Density for Cold Storage Markets: 128Wh/kg enables compact, lightweight battery packs for harsh environments.
- Military-Grade Reliability at Civilian Prices: Extreme durability and robust cycle life (1500 cycles @ 80% DOD) without premium cost.
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APPLICATION SCOPE: Off-grid solar storage in cold regions, EV auxiliary batteries, telecom backup in northern climates, polar research equipment, cold-chain logistics, and portable power for winter sports.
PACKAGING: Anti-static plastic trays (50 cells per tray, 200 cells per master carton). Insulated terminal covers included for safe transport.
IMPORTANT NOTICE: For charging at -20°C, use the recommended CC-CV profile with a reduced charge current (≤0.2C). The cell will not accept charge below -20°C. Always pair with a low-temperature BMS that enables charging only when cell temperature is within safe limits.
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Frequently Asked Technical Questions
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Can the AF26650LFP01 be charged at -20°C without heating?
Yes, the cell is specifically designed for direct charging at -20°C when using a reduced current (0.2C). No external heater is required, making it ideal for remote off-grid systems in cold climates.
What is the expected cycle life at -10°C?
At -10°C with 0.5C charge/discharge, cycle life is reduced by approximately 20% compared to 25°C, still exceeding 1200 cycles to 80% SOH. For maximum longevity, keep the battery above 0°C if possible.
Is this cell compatible with standard 26650 battery holders?
Yes, the AF26650LFP01 follows the standard 26mm diameter and 65mm height format, making it a drop-in replacement for most 26650 holders and pack configurations. Always verify terminal polarity and insulation.
What safety certifications are available?
The cell complies with UL 1642, IEC 62133-2:2021, UN38.3, and CE. Batch-level test reports including nail penetration, overcharge, and thermal abuse are available upon request.
Can I parallel multiple cells for higher capacity?
Yes, parallel connection is allowed. Ensure cells are matched within 5% in voltage and internal resistance before paralleling. Use a common busbar and avoid mixing cells from different production batches.
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