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High density 26650 LFP cylindrical cell battery engineered with an advanced olivine cathode architecture for large scale stationary storage packs.

26650 LFP Cylindrical Battery 3400mAh 4-Pack

$32.00

Institutional Procurement & Supply Compliance: As a verified US supplier, Atomfair accepts formal institutional Purchase Orders (POs), contract billing schedules, and custom procurement loops for university and national laboratories, and corporate R&D departments globally.

Commercial-grade 26650 LiFePO4 cells, 3400mAh at 3.2V, 128Wh/kg, ≤20mΩ IR, ISO 9001:2025 and IATF 16949 traceable for ESS and backup packs. In stock.

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Description

3400mAh High-Capacity 26650 Lithium Iron Phosphate (LFP) Cylindrical Battery (4-Pack)

COMMERCIAL GRADE · PRODUCTION

Product Overview
The ATOMFAIR® 26650 High-Capacity LFP (LiFePO4) cylindrical cell delivers industry-leading energy density of 128Wh/kg with a nominal capacity of 3400mAh, making it an ideal choice for energy-dense applications. Engineered for long-duration and high-voltage series configurations, this cell offers exceptional cell-to-cell consistency, a design life of 20 years, and a 5-year warranty. With 1C charge/discharge cycle life reaching 7000 cycles and standard cycle life of 2000 cycles at 100% DOD, it provides outstanding longevity for stationary storage, EV auxiliary batteries, and backup power systems. Featuring a built-in safety vent and nail penetration without fire or explosion, it combines high energy with intrinsic LFP safety. This model is a proven specification for European and North American markets with long-term stable mass production. For bulk inquiries or official volume quotations, please contact us via email at inquiry@atomfair.com.

Technical Specifications

PARAMETER VALUE
General Parameters
Nominal Capacity (0.2C) 3400 mAh
Minimum Capacity (0.2C) 3400 mAh
Nominal Voltage 3.2 V
Energy Density 128 Wh/kg
Internal Resistance ≤20 mΩ
Weight ≈85 g
Cycle Life (100% DOD, 25°C) 2000 cycles
Charge Parameters
Max. Charge Voltage 3.65 ± 0.03 V
Standard Charge Current 0.5C
Max. Charge Current 2C
Discharge Parameters
Min. Discharge Voltage 2.0 V
Standard Discharge Current 1C
Max. Continuous Discharge Current 3C
Temperature Ranges
Charge Temperature 0°C to 45°C
Discharge Temperature -20°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
  • High Capacity 26650 LFP Cell: 3400mAh nominal capacity with 128Wh/kg energy density — ideal for high-voltage, large-format battery packs.
  • Exceptional Cycle Life: 7000 cycles at 1C charge/discharge, and 2000 cycles at 100% DOD under standard conditions.
  • Long Design Life & Warranty: 20-year design life with 5-year warranty, ensuring reliable performance for long-term installations.
  • Excellent Cell Consistency: Suitable for high-voltage series configurations with minimal voltage variation between cells.
  • Intrinsic Safety: Built-in explosion-proof vent, passes nail penetration without fire or explosion, zero thermal runaway risk.
  • Globally Proven: Long-term stable mass production, designated model for European and North American markets.

APPLICATION SCOPE: Stationary energy storage systems (ESS), EV auxiliary batteries, telecom backup, UPS systems, solar street lights, and high-voltage battery packs requiring excellent cell matching.
PACKAGING: Anti-static plastic trays (50 cells per tray, 200 cells per master carton). Insulated terminal covers included for safe transport.
IMPORTANT NOTICE: For maximum cycle life, operate cells within recommended voltage window (2.5V – 3.65V) and avoid sustained high-temperature operation. Always use a dedicated LFP BMS with cell balancing, especially for high-voltage series strings.

TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
EMAIL: inquiry@atomfair.com
Manufacturer: Atomfair LLC
Brand: ATOMFAIR®

This cell requires strict voltage and temperature control to maintain safety and longevity. A dedicated LFP battery management system is mandatory for series configurations.

  • Operating Voltage Window: Maintain cell voltage between 2.5V and 3.65V during operation to prevent over-discharge or overcharge.
  • Charge Temperature Range: Charge the cell only within an ambient temperature range of 0°C to 45°C to avoid capacity degradation.
  • Discharge Temperature Range: Discharge is permitted from -20°C to 60°C, but avoid sustained high-temperature operation.
  • Battery Management System: Always use a dedicated LFP battery management system with cell balancing for series strings.
  • Transport Handling: Use anti-static trays and retain insulated terminal covers on unused terminals during transport and storage.

These steps ensure safe initial assembly and charging of the 26650 LFP battery pack. Following them prevents overvoltage and thermal damage.

Required Equipment: LFP battery management system (BMS), Compatible battery charger

  1. Inspect Terminals
    Inspect each cell's terminals for cleanliness and any damage before assembly.
  2. Verify Open-Circuit Voltage
    Measure the open-circuit voltage of each cell to confirm it lies within the 2.5V to 3.65V range.
  3. Connect Cells in Series
    Connect the cells in series using appropriate conductors and observe correct polarity.
  4. Install Battery Management System
    Install a dedicated LFP battery management system with balancing functionality.
  5. Set Charge Parameters
    Set the charger to a maximum charge voltage of 3.65V per cell and a standard charge current of 0.5C.
  6. Verify Ambient Temperature
    Verify that the charging environment temperature is between 0°C and 45°C before starting the charge cycle.

What is the trade-off between depth of discharge and cycle life for the 3400mAh 26650 LFP cell?

Operating at 100% depth of discharge (discharge to 2.0V) yields a standard cycle life of 2000 cycles. For maximum cycle life, the manufacturer recommends operating within a narrower voltage window of 2.5V to 3.65V, which reduces usable capacity but extends cycle life beyond the 2000-cycle specification. The exact cycle life at reduced DOD is not stated, but the cell achieves 7000 cycles under 1C charge/discharge conditions, which imply controlled DOD and moderate rates.

Can the 3400mAh 26650 LFP cells be used in high-voltage series strings without a BMS?

No. Although the cells feature excellent cell-to-cell consistency suitable for high-voltage series configurations, a dedicated LFP BMS with active cell balancing is always required, especially for long series strings. The BMS is necessary to maintain the per-cell voltage within the safe window (2.0V min discharge, 3.65V max charge) and prevent over-discharge or overcharge damage that would reduce the design life of 20 years.

What are the charge current limits and temperature requirements for the 3400mAh 26650 LFP cell?

The standard charge current is 0.5C (1700mA) and the maximum charge current is 2C (6800mA). Charging must be performed within a temperature range of 0°C to 45°C, and the charge voltage must be limited to 3.65 ± 0.03V. The cell also has a discharge temperature range of -20°C to 60°C, making it suitable for a wide range of environmental conditions.

This 26650 LFP 3400mAh cell delivers high energy density and exceptional cycle life with intrinsic safety, but requires careful thermal management and a dedicated BMS for high-voltage series configurations.

Positive

  • High energy density and cycle life: 128Wh/kg energy density and 3400mAh capacity with 2000 cycles at 100% DOD and up to 7000 cycles at 1C, ideal for long-duration stationary storage.
  • Intrinsic LFP safety: Built-in explosion-proof vent and nail penetration resistance ensure zero thermal runaway risk, suitable for high-safety applications.

Trade-offs

  • Limited charge temperature range: Charge temperature limited to 0°C-45°C; sustained high-temperature operation degrades cycle life. Requires thermal management for cold environments.
  • Requires dedicated BMS for series strings: High-voltage series configurations demand a LFP BMS with cell balancing due to strict voltage window (2.5V-3.65V) for maximum cycle life.

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). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).

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