Cylindrical 21700 High-Power Cell
Molicel M65A
Cylindrical 21700 cell delivering 6.5 Ah capacity with 314 Wh/kg energy density and 26 A maximum discharge rate.
Overview
The Molicel M65A is a high-energy lithium-ion cylindrical 21700 cell designed for applications that demand high energy density and extended runtime. Released in 2025 and with the manufacturer based in Taiwan, 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 26 A, making it well suited to energy-focused applications requiring extended runtime. At 314 Wh/kg, the M65A ranks among the highest gravimetric energy densities in the 21700 format within the Voltt library.
Key Features
High discharge rate: 26 A continuous (4.0 C)
Charging rate: 2.0 C charging rate
Energy density: 314 Wh/kg
Power density: 1256 W/kg
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Molicel
Model
INR-21700-M65A
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
Taiwan
Release year
2025
Nominal voltage
3.6
Energy capacity [Wh]
23.4
Capacity [Ah]
6.5
Gravimetric energy density [Wh/kg]
314
Gravimetric power density [W/kg]
1256
Max continuous discharge [A]
26
Volume [cm³]
25.61
Mass [g]
74.5
Positive electrode (cathode)
Negative electrode (anode)
Value
Applications & Use‑Cases
The Molicel M65A 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.
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.
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 Molicel M65A across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The Molicel M65A constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The Molicel M65A constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The Molicel M65A 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 Molicel M65A 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 Molicel M65A with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Molicel
E-One Moli Energy is a Taiwanese high-performance lithium-ion battery manufacturer
Molicel, a division of Taiwan's E-One Moli Energy Corp., is a leading manufacturer of high-performance lithium-ion battery cells for demanding applications. Renowned for their exceptional power density and thermal stability, Molicel 21700 cells are widely adopted in electric vehicles, power tools, and energy storage systems. Their innovative cell chemistry delivers superior cycle life and fast-charging capabilities, making them a preferred choice for automotive OEMs and industrial battery pack integrators. Molicel's commitment to quality manufacturing and rigorous testing standards ensures reliable performance across extreme operating conditions, positioning them as a key player in advanced battery technology development.
Frequently Asked Questions
What is the capacity and voltage of the Molicel M65A?
The Molicel M65A 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 Molicel M65A?
The Molicel M65A supports continuous discharge rates up to 26 A, delivering a power density of 1256 W/kg.
How much does the Molicel M65A weigh and what is its volume?
The cell has a mass of 74.5 g and a volume of 25.61 cm³.
In which industries is the Molicel M65A commonly used?
The Molicel M65A is used across aviation, motorsports, e-mobility, applications that demand high power delivery and reliable performance across demanding duty cycles.
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.
