Cylindrical 21700 High-Power Cell
FEB 40EBX
Cylindrical 21700 cell delivering 4 Ah capacity, 203 Wh/kg energy density and 12 A maximum discharge rate.
Overview
The FEB 40EBX is a high-power Li-ion cylindrical 21700 cell designed for applications that demand sustained high current. Released in 2024 and with the manufacturer based in China, this cylindrical 21700 cell delivers 4 Ah capacity and 14.4 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 12 A, making it well suited to high-power systems.
Key Features
High discharge rate: 12 A continuous (3.0 C)
Energy density: 203 Wh/kg
Power density: 608 W/kg
Capacity: 4 Ah nominal capacity
Applications: e-mobility, motorsports, aviation
Technical Specifications from the Manufacturer
Parameter
Manufacturer
FEB
Model
21700-40EBX
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2024
Nominal voltage
3.6
Energy capacity [Wh]
14.4
Capacity [Ah]
4
Gravimetric energy density [Wh/kg]
203
Gravimetric power density [W/kg]
608
Max continuous discharge [A]
12
Volume [cm³]
26.1191
Mass [g]
71
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Graphite
Value
Applications & Use‑Cases
The FEB 40EBX is well suited to the following applications due to its 21700 format and high power performance.
E-Mobility: Requires balanced energy and power density for range and acceleration, high cycle life for daily use, and robust calendar life to ensure long-term reliability.
Motorsports: Demands sustained high discharge under competitive load profiles, rapid transient response for acceleration, and thermal stability to maintain performance during race conditions.
Aviation: Requires high specific energy for extended flight duration, high power-to-weight ratio for climb performance, and reliable operation across wide temperature ranges at altitude.
General Applications: Suitable for applications requiring reliable lithium-ion performance with proven cycle life, consistent capacity delivery, and operational safety across diverse use cases.
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Performance & Model Data
Below are modelled performance metrics for the FEB 40EBX across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The FEB 40EBX constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The FEB 40EBX constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The FEB 40EBX pulse power map evaluates short-duration load responses, allowing engineers to determine the maximum available power as a function of state of charge and temperature.
Dynamic Profile Response
The FEB 40EBX mission-profile plots simulate real-world duty cycles, showing how the cell manages dynamic power demands and temperature changes.
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Case Studies
See how we helped McMurtry reduce cell evaluation time by 70% through data driven testing and modelling.
Motorsports
McMurtry Automotive: Faster cell evaluation
McMurtry Automotive used The Voltt and validated cell models to evaluate the transition from the Molicel P45B to P50B during early pack concept development.
Side by side modelling enabled rapid comparison of electrical and thermal behaviour, avoiding lengthy physical test campaigns. This approach reduced cell evaluation time by seven months, allowing the team to lock in cell selection and pack assumptions earlier while lowering technical risk and accelerating vehicle development.
Comparison with Related Cells
Compare the FEB 40EBX with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
FEB
FEB is a Chinese cylindrical lithium-ion cell manufacturer
Far East Battery, trading as FEB, is a Chinese cell manufacturer founded in 2009 and a core subsidiary of the listed Far East Smart Energy group. The company develops and manufactures cylindrical lithium-ion cells, modules and complete pack systems, with 18650 and 21700 formats forming the backbone of its catalogue. FEB serves electric vehicles, stationary energy storage, e-bikes, power tools and consumer electronics, giving it volume across several high-turnover segments. The company has pushed mass-produced 21700 capacity upward in successive steps, from 5,000 mAh to 6,000 mAh at around 300 Wh/kg, and subsequently to 6,500 mAh. Its position rests on driving capacity records within the established cylindrical formats rather than pursuing novel chemistries or cell architectures.
Frequently Asked Questions
What is the capacity and voltage of the FEB 40EBX?
The FEB 40EBX has a nominal capacity of 4 Ah and a nominal voltage of 3.6 V, providing 14.4 Wh of energy per cell.
What is the maximum continuous discharge capability of the FEB 40EBX?
The FEB 40EBX supports continuous discharge rates up to 12 A, delivering a power density of 608 W/kg.
How much does the FEB 40EBX weigh and what is its volume?
The cell has a mass of 71 g and a volume of 26.12 cm³.
In which industries is the FEB 40EBX commonly used?
The FEB 40EBX is used across e-mobility, motorsports, aviation, applications that demand sustained high current.
What is The Voltt and how does it accelerate cell evaluation?
The Voltt is About Energy's digital cell simulation platform that models electrochemical and thermal performance, reducing evaluation time by up to 70% compared to laboratory testing.
What data can be extracted using The Voltt?
Engineers can simulate and visualise voltage, temperature, and power responses under constant-current or mission-profile conditions, generating detailed discharge plots to support accurate cell comparison and validation.
