Cylindrical 21700 High-Power Cell
Samsung 40V
Cylindrical 21700 cell delivering 4 Ah capacity and 50 A maximum discharge rate.
Overview
The Samsung 40V is a high-power lithium-ion cylindrical 21700 cell designed for applications that demand very high continuous discharge rates. Released in 2025 and with the manufacturer based in South Korea, 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 50 A, making it well suited to high-power systems operating under aggressive discharge profiles. A continuous discharge capability of 12.5 C places the 40V among the highest-rated cells in the 21700 format within the Voltt library.
Key Features
Extremely high discharge rate: 50 A continuous (12.5 C)
Charging rate: 3.0 C charging rate
Applications: aviation, motorsports, drones
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Samsung
Model
40V
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
South Korea
Release year
2025
Nominal voltage
Energy capacity [Wh]
14.4
Capacity [Ah]
4
Gravimetric energy density [Wh/kg]
Gravimetric power density [W/kg]
Max continuous discharge [A]
50
Volume [cm³]
Mass [g]
Positive electrode (cathode)
Negative electrode (anode)
Value
Applications & Use‑Cases
The Samsung 40V is well suited to the following applications due to its cylindrical 21700 form factor and high power 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: Demands high gravimetric power density for thrust and payload capacity, rapid current response for flight control, and stable voltage delivery across dynamic flight profiles.
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 Samsung 40V across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The Samsung 40V constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The Samsung 40V constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The Samsung 40V 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 Samsung 40V 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 Samsung 40V with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Samsung SDI
Samsung SDI is a leading South Korean battery manufacturer
Samsung SDI is a global leader in lithium-ion battery manufacturing, producing advanced 21700 cylindrical cells for electric vehicles, consumer electronics, and energy storage systems. With decades of battery technology expertise, Samsung delivers high-energy-density cells featuring exceptional safety characteristics and long cycle life. Their 21700 format cells power major automotive platforms worldwide, incorporating proprietary cathode materials and manufacturing processes. Samsung SDI's extensive R&D investments drive continuous improvements in energy density, charging speed, and thermal management. As part of the Samsung Group, SDI leverages world-class manufacturing facilities and quality control systems, making them a trusted battery supplier for premium electric vehicle manufacturers and industrial applications.
Frequently Asked Questions
What is the capacity and voltage of the Samsung 40V?
The Samsung 40V 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 Samsung 40V?
The Samsung 40V supports continuous discharge rates up to 50 A.
How much does the Samsung 40V weigh and what is its volume?
Physical dimensions are not specified for this cell.
In which industries is the Samsung 40V commonly used?
The Samsung 40V is used across aviation, motorsports, drones, applications that demand very high power output and thermal management under extreme discharge.
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.
