Pouch High-Power Cell
BEI MUL17A
High-power pouch cell delivering 18 Ah capacity with 434 Wh/kg energy density and 170 A maximum discharge rate.
Overview
The BEI MUL17A is a high-power Li Metal pouch cell designed for applications that demand both very high energy density and sustained high current delivery. Manufactured in South Korea, this pouch cell delivers 18 Ah capacity and 69.4 Wh of energy at a nominal voltage of 3.86 V, with a maximum continuous discharge capability of 170 A, making it well suited to high-performance aviation, motorsports, and unmanned systems. As a lithium metal cell, the BEI MUL17A achieves a gravimetric energy density of 434 Wh/kg, substantially higher than conventional graphite-anode pouch cells at this capacity level, while simultaneously delivering 9.4 C discharge — a combination that is uncommon in commercially available pouch formats.
Key Features
Extremely high discharge rate: 170 A continuous (9.4 C)
Charging rate: 2.0 C charging rate
Energy density: 434 Wh/kg
Power density: 4,101 W/kg
Applications: Aviation, motorsports, drones
Technical Specifications from the Manufacturer
Parameter
Manufacturer
BEI
Model
MUL17A
Type
Li Metal
Form factor
Pouch
Country of origin
South Korea
Release year
2025
Nominal voltage
3.86
Energy capacity [Wh]
69.4
Capacity [Ah]
18
Gravimetric energy density [Wh/kg]
434
Gravimetric power density [W/kg]
4104
Max continuous discharge [A]
170
Volume [cm³]
73.36
Mass [g]
159.9
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Anode-free
Value
Applications & Use‑Cases
The BEI MUL17A is well suited to the following applications due to its pouch format and exceptional combined energy and power density performance.
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.
Motorsports: Demands sustained high discharge under competitive load profiles, rapid transient response for acceleration, and thermal stability to maintain performance during race conditions.
Drones: Requires high power-to-weight ratio for lift and manoeuvrability, stable discharge under variable loads, and compact packaging for efficient pack integration.
General Applications: Suitable for applications requiring reliable high-energy-density performance with consistent capacity delivery and operational safety across diverse use cases.
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Performance & Model Data
Below are modelled performance metrics for the BEI MUL17A across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access BEI MUL17A constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not MUL17A data.)
Constant Current Temperature
Access BEI MUL17A thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not MUL17A data.)
Pulse Power Behaviour
Access BEI MUL17A pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not MUL17A data.)
Dynamic Profile Response
Access BEI MUL17A mission profile simulations in Voltt to prove the pack holds up over a real duty cycle before you build it. (Chart shown is illustrative, not MUL17A data.)
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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 BEI MUL17A with similar Pouch cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
BEI
BEI is a South Korean lithium-metal pouch cell manufacturer
BEI was founded in 2020 and is based in Ansan, South Korea, where it operates a pilot production facility for lithium-metal pouch cells, supported by a research centre in Boston and an office in Tokyo. Its cells replace the conventional graphite anode with lithium metal, using proprietary coatings and non-flammable electrolytes to reach energy densities well beyond mainstream lithium-ion. The company designs for drones, uncrewed aerial systems, robotics and defence platforms, where high energy and high discharge rate are required together. Its anode-free architecture is aimed at thin, light cells that hold performance at low temperature. BEI is among the few producers moving lithium metal toward series manufacture.
Frequently Asked Questions
What is the capacity and voltage of the BEI MUL17A?
The BEI MUL17A has a nominal capacity of 18 Ah and a nominal voltage of 3.86 V, providing 69.4 Wh of energy per cell.
What is the maximum continuous discharge capability of the BEI MUL17A?
The BEI MUL17A supports continuous discharge rates up to 170 A, delivering exceptional power density of 4,101 W/kg.
How much does the BEI MUL17A weigh and what is its volume?
The cell has a mass of 160 g and a volume of 73.36 cm3.
In which industries is the BEI MUL17A commonly used?
The BEI MUL17A is used across aviation, motorsports, and drones, applications that demand both exceptional energy density and very high discharge capability in a lightweight pouch format.
What is The Voltt and how does it accelerate cell evaluation?
The Voltt holds 500+ verified commercial cell datasheets alongside validated simulation models built from cells characterised in About:Energy's own lab. Engineers screen candidates against their real duty cycle before buying hardware, which cut cell evaluation time by seven months for McMurtry Automotive and reduces evaluation cycles by up to 70%.
What data can be extracted using The Voltt?
Constant-current discharge curves at multiple C-rates, DC internal resistance against state of charge and temperature, pulse power maps, thermal response, and full mission-profile simulation with user-defined pack configurations. Models are available as equivalent circuit, thermal, physics-based and degradation formats, exportable for use in MATLAB, Simulink and Python workflows.
