Cylindrical 21700 High-Energy Cell
FEB 68E
High-energy cylindrical 21700 cell delivering 6.5 Ah capacity with 312 Wh/kg energy density and 13 A maximum discharge rate.
Overview
The FEB 68E is a high-energy Li-ion cylindrical 21700 cell designed for applications that demand high energy density and extended runtime. Manufactured in China, this cylindrical 21700 cell delivers 6.5 Ah capacity and 23.4 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 13 A, making it well suited to e-mobility, energy storage, and general-purpose applications requiring extended cycle life. With a gravimetric energy density of 312 Wh/kg, the FEB 68E sits at the upper end of the 21700 energy density range, making it a compelling option for pack designers prioritising range over peak power.
Key Features
Discharge rate: 13 A continuous (2.0 C)
Charging rate: 1.0 C charging rate
Energy density: 312 Wh/kg
Power density: 624 W/kg
Applications: E-mobility, energy storage, aviation
Technical Specifications from the Manufacturer
Parameter
Manufacturer
FEB
Model
68E
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2025
Nominal voltage
3.6
Energy capacity [Wh]
23.4
Capacity [Ah]
6.5
Gravimetric energy density [Wh/kg]
312
Gravimetric power density [W/kg]
624
Max continuous discharge [A]
13
Volume [cm³]
28.29
Mass [g]
75
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Value
Applications & Use‑Cases
The FEB 68E is well suited to the following applications due to its cylindrical 21700 format and high energy density 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.
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.
Energy Storage: Requires high energy density for compact installations, long cycle life to minimise replacement costs, and reliable capacity retention across varying charge and discharge rates.
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 68E across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The FEB 68E constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The FEB 68E constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The FEB 68E 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 68E 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 68E 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 lithium-ion battery manufacturer focused on high-energy cylindrical cells
FEB is a Chinese battery manufacturer specialising in high-energy-density cylindrical lithium-ion cells for electric vehicles and energy storage applications. Their 21700 format cells target gravimetric energy density leadership, with the 68E demonstrating performance at the upper end of the commercial cylindrical cell market. FEB focuses on Ni-based cathode chemistry and advanced cell engineering to deliver competitive energy capacity within the standard 21700 form factor. Their manufacturing approach emphasises process precision and material quality to support consistent cell-to-cell performance across large production volumes. FEB positions itself as a supplier for pack integrators and OEMs seeking maximum energy density in a proven cylindrical format.
Frequently Asked Questions
What is the capacity and voltage of the FEB 68E?
The FEB 68E has a nominal capacity of 6.5 Ah and a nominal voltage of 3.6 V, providing 23.4 Wh of energy per cell.
What is the maximum continuous discharge capability of the FEB 68E?
The FEB 68E supports continuous discharge rates up to 13 A, delivering a power density of 624 W/kg.
How much does the FEB 68E weigh and what is its volume?
The cell has a mass of 75 g and a volume of 28.29 cm3.
In which industries is the FEB 68E commonly used?
The FEB 68E is used across e-mobility, energy storage, and aviation, applications that demand high energy density and reliable long-cycle performance.
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.
