4000mAh High-Capacity 26650 Lithium Iron Phosphate (LFP) Cylindrical Battery | ATOMFAIRCOMMERCIAL GRADE · PRODUCTION
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TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
EMAIL: inquiry@atomfair.com
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Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
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The ATOMFAIR 26650 LFP cell requires strict voltage and temperature limits to ensure safe operation and longevity. A dedicated LFP BMS with cell balancing is mandatory for series configurations, and sustained high-temperature operation must be avoided.
- Voltage Window: Operate the cell within a voltage window of 2.5V to 3.65V to prevent over-discharge or over-charge damage.
- Temperature Limits: Charge the cell between 0°C and 45°C and discharge between -20°C and 60°C to avoid thermal stress.
- BMS Requirement: Use a dedicated LFP battery management system with cell balancing for high-voltage series configurations.
- High Temperature Avoidance: Avoid sustained operation at high temperatures to maximize cycle life and prevent capacity degradation.
Follow these steps to safely handle and deploy the ATOMFAIR 26650 LFP cell in a battery pack. Proper voltage verification, BMS integration, and temperature monitoring are essential for safety and longevity.
Required Equipment: Voltmeter, LFP Battery Management System
- Verify Voltage
Verify the open-circuit voltage of each cell is between 2.5V and 3.65V using a voltmeter. - Remove Terminal Covers
Remove the insulated terminal covers from the positive and negative terminals before installation. - Connect BMS
Connect the cells in series or parallel with a dedicated LFP BMS that provides cell balancing. - Monitor Temperature
Monitor the operating temperature and avoid sustained high-temperature operation. - Store Unused Cells
Store unused cells in the provided anti-static plastic trays to prevent short circuits and damage.
What is the trade-off between cycle life and depth of discharge for the ATOMFAIR 26650 4000mAh LFP cell?
At 100% depth of discharge (DOD) under standard conditions, the cell delivers 2000 cycles. However, when operated at 1C charge/discharge, cycle life extends to 6000 cycles, indicating that shallower cycling or controlled C-rates significantly improves longevity. For maximum cycle life, the manufacturer recommends operating within 2.5V–3.65V and avoiding sustained high temperatures.
Can the ATOMFAIR 26650 LFP cell be integrated into high-voltage series strings without active balancing?
The cell offers excellent cell-to-cell consistency suitable for high-voltage series configurations, but a dedicated LFP BMS with cell balancing is required, especially for high-voltage series strings. The cell's low internal resistance (≤20 mΩ) and tight voltage tolerance (3.65 ± 0.03 V max charge) support consistent performance, but active balancing is still necessary to prevent voltage drift over many cycles.
What are the storage and handling requirements for the ATOMFAIR 26650 LFP cell to ensure safety during transport?
Cells are packaged in anti-static plastic trays (50 per tray, 200 per master carton) with insulated terminal covers for safe transport. The cell features a built-in explosion-proof vent and passes nail penetration without fire or explosion, but for maximum safety, avoid sustained high-temperature operation and always use a dedicated LFP BMS. Charge temperature range is 0°C to 45°C; discharge range is -20°C to 60°C.
The ATOMFAIR 26650 LFP cell delivers 4000mAh capacity with 142Wh/kg energy density and 6000 cycles at 1C rate, but requires strict voltage window operation (2.5V–3.65V) and dedicated BMS for series configurations to avoid accelerated degradation.
Positive
- Highest capacity 26650 LFP cell: 4000mAh nominal capacity with 142Wh/kg energy density enables high-voltage, large-format battery packs with fewer cells in series, reducing assembly complexity and internal resistance.
- Exceptional cycle life and safety: 6000 cycles at 1C charge/discharge and 2000 cycles at 100% DOD, combined with nail penetration pass without fire or explosion and built-in safety vent, provide intrinsic thermal runaway protection for long-duration stationary storage.
Trade-offs
- Narrow voltage window requirement: Optimal cycle life requires operation within 2.5V–3.65V window; sustained operation outside this range or at high temperatures accelerates capacity fade, demanding precise BMS voltage cutoff control.
- BMS dependency for series strings: High-voltage series configurations require a dedicated LFP BMS with active cell balancing to maintain cell-to-cell consistency and prevent over-discharge or over-voltage conditions, adding system cost and complexity.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD excl. heavy equipment). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
