Product Overview
|
| The ATOMFAIR® 26650 Low-Temperature LFP (LiFePO4) cylindrical cell is engineered for extreme cold-weather energy storage. With a nominal capacity of 3400mAh and the ability to charge at temperatures as low as -30°C and discharge down to -50°C without external heating, this cell eliminates the need for battery warmers in harsh winter environments. Offering high continuous discharge current (3C / 10.2A), pulse capability (5C / 17A for 30s), excellent low-temperature efficiency (>90% at -50°C), military-grade reliability, and competitive pricing, it is the ideal choice for off-grid solar storage, EV auxiliary batteries, cold-region telecom backup, polar research, and cold-chain logistics. |
Technical Specifications
|
| PARAMETER |
VALUE |
| General Parameters |
| Nominal Capacity (0.5C) |
3400 mAh |
| Minimum Capacity (0.5C) |
3350 mAh |
| Nominal Voltage |
3.2 V |
| Energy Density |
124 Wh/kg |
| Internal Resistance |
≤15 mΩ |
| Weight |
≈85 g |
| Cycle Life (80% DOD, 25°C) |
2000 cycles |
| Dimensions (Diameter x Height) |
26.3±0.1 mm x 65.7±0.2 mm |
| Charge Parameters |
| Max. Charge Voltage |
3.65 ± 0.03 V |
| Standard Charge Current |
0.5C |
| Max. Charge Current |
3.0C @ T > 0°C; 0.5C @ T ≤ 0°C; 0.2C @ T ≤ -20°C |
| Discharge Parameters |
| Min. Discharge Voltage |
2.00 V @ T > -20°C; 1.50 V @ T ≤ -20°C |
| Standard Discharge Current |
1.0C |
| Max. Continuous Discharge Current |
3.0C |
| Discharge Performance |
>90% @ -40°C to 1.5V; >90% @ -20°C to 2.0V; >98% @ 60°C to 2.0V |
| Temperature Ranges |
| Charge Temperature |
-30°C to 60°C |
| Discharge Temperature |
-50°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. |
|
Key Features & Advantages
|
- Direct Charge at Sub-Zero Temperatures: No pre-heating required — capable of charging at -30°C with reduced current.
- Excellent Low-Temperature Discharge Efficiency: >90% capacity retention at -50°C, ensuring reliable power in extreme cold.
- High Rate Capability: Supports 3C continuous discharge and 5C pulse (30s) over a wide temperature range (-50°C to 60°C).
- Military-Grade Reliability at Civilian Prices: Exceptional durability and 2000-cycle life (80% DOD) without premium cost.
|
|
APPLICATION SCOPE: Off-grid solar storage in arctic regions, EV auxiliary batteries, telecom backup in extreme 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 -30°C, use the recommended CC-CV profile with a reduced charge current (≤0.2C). The cell will not accept charge below -30°C. Always pair with a low-temperature BMS that enables charging only when cell temperature is within safe limits.
|
Frequently Asked Technical Questions
|
Can the AF26650LFP04 be charged at -30°C without heating?
Yes, the cell is specifically engineered for direct charging at -30°C using a reduced current (0.2C). No external heater is required, making it ideal for remote off-grid systems in polar regions.
What is the actual discharge efficiency at -50°C?
The cell delivers >90% of its rated capacity when discharged at -50°C to 1.5V cut-off, ensuring reliable startup and operation in extreme Arctic conditions.
Is this cell compatible with standard 26650 battery holders?
Yes, the AF26650LFP04 follows the standard 26.3mm diameter and 65.7mm 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.
|
|
