Pouch High-Power Cell
BEI MUL03S
Pouch cell delivering 3 Ah capacity, 397 Wh/kg energy density and 24 A maximum discharge rate.
Overview
The BEI MUL03S is a high-power Li-ion pouch cell designed for applications that demand sustained high current. Released in 2026 and with the manufacturer based in South Korea, this pouch cell delivers 3 Ah capacity and 11.52 Wh of energy at a nominal voltage of 3.84 V, with a maximum continuous discharge capability of 24 A, making it well suited to high-power systems. A gravimetric energy density of 397 Wh/kg puts it at the upper end of the library. The pouch format allows the pack designer to trade cell thickness against footprint.
Key Features
High discharge rate: 24 A continuous (8.0 C)
Energy density: 397 Wh/kg
Power density: 3178 W/kg
Capacity: 3 Ah nominal capacity
Applications: drones, aviation, motorsports
Technical Specifications from the Manufacturer
Parameter
Manufacturer
BEI
Model
MUL03S
Type
Li Metal
Form factor
Pouch
Country of origin
South Korea
Release year
2026
Nominal voltage
3.84
Energy capacity [Wh]
11.52
Capacity [Ah]
3
Gravimetric energy density [Wh/kg]
397
Gravimetric power density [W/kg]
3178
Max continuous discharge [A]
24
Volume [cm³]
15.7039
Mass [g]
29
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Anode-free
Value
Applications & Use‑Cases
The BEI MUL03S is well suited to the following applications due to its pouch format and high power performance.
Drones: Demands high gravimetric power density for thrust and payload capacity, rapid current response for flight control, and stable voltage delivery across dynamic flight profiles.
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.
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 BEI MUL03S across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The BEI MUL03S constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The BEI MUL03S constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The BEI MUL03S 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 BEI MUL03S 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 BEI MUL03S 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 battery manufacturer
BEI is a South Korean battery manufacturer specialising in advanced lithium metal pouch cells for high-performance and defence-adjacent applications. Their cell technology targets industry-leading gravimetric energy density by replacing conventional graphite anodes with lithium metal, enabling step-change improvements in energy-to-weight ratio. BEI designs cells for demanding end-uses including aviation, motorsports, and unmanned systems where both high energy density and high discharge rate are simultaneously required. With a focus on next-generation anode materials and precision pouch manufacturing, BEI combines the flexibility of the pouch format with the electrochemical performance of lithium metal chemistry. The company positions itself at the frontier of commercial lithium metal cell production, targeting customers for whom conventional lithium-ion energy density is a limiting factor.
Frequently Asked Questions
What is the capacity and voltage of the BEI MUL03S?
The BEI MUL03S has a nominal capacity of 3 Ah and a nominal voltage of 3.84 V, providing 11.52 Wh of energy per cell.
What is the maximum continuous discharge capability of the BEI MUL03S?
The BEI MUL03S supports continuous discharge rates up to 24 A, delivering a power density of 3178 W/kg.
How much does the BEI MUL03S weigh and what is its volume?
The cell has a mass of 29 g and a volume of 15.7 cm³.
In which industries is the BEI MUL03S commonly used?
The BEI MUL03S is used across drones, aviation, motorsports, 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.
