Cylindrical 21700 High-Power Cell
Tenpower 40XG
High-power cylindrical 21700 cell delivering 4 Ah capacity with 218 Wh/kg energy density and 90 A maximum discharge rate.
Overview
The Tenpower 40XG is a high-power lithium-ion cylindrical 21700 cell designed for applications that demand sustained high current and competitive energy storage. With the manufacturer based in Malaysia, 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 90 A, making it well suited to high-power systems such as aviation, motorsports, and drones. The 40XG stands out within the 4 Ah class by pairing a standard 4 Ah energy capacity with the 22.5 C discharge rate more commonly found in sub-3 Ah power cells, and its silicon-additive graphite anode contributes to the cell's gravimetric energy density of 218 Wh/kg relative to peers at this discharge level.
Key Features
Extremely high discharge rate: 90 A continuous (22.5 C)
Energy density: 218 Wh/kg
Power density: 4909 W/kg
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Tenpower
Model
INR21700-40XG
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
Malaysia
Release year
2025
Nominal voltage
3.6
Energy capacity [Wh]
14.4
Capacity [Ah]
4
Gravimetric energy density [Wh/kg]
218
Gravimetric power density [W/kg]
4909
Max continuous discharge [A]
90
Volume [cm³]
25.05
Mass [g]
66
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Graphite/Si additive
Value
Applications & Use‑Cases
The Tenpower 40XG is well suited to the following applications due to its cylindrical 21700 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 Tenpower 40XG across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access Tenpower 40XG constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not 40XG data.)
Constant Current Temperature
Access Tenpower 40XG thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not 40XG data.)
Pulse Power Behaviour
Access Tenpower 40XG pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not 40XG data.)
Dynamic Profile Response
Access Tenpower 40XG 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 40XG 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 Tenpower 40XG with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Tenpower
Tenpower is a Chinese cylindrical lithium-ion cell manufacturer
Jiangsu Tenpower Lithium was founded in 2006 and is based in Zhangjiagang, China, where it develops and manufactures cylindrical lithium-ion cells in the 18650 and 21700 formats. Its catalogue covers both lithium iron phosphate and nickel-based chemistries, tuned for high power delivery, thermal stability and fast charging. The company supplies power tools, electric two-wheelers and light mobility, vacuum cleaners and energy storage customers across more than forty countries, having shipped cells in the billions since founding. It is a subsidiary of a listed Chinese industrial group, which underwrites its manufacturing capacity. Tenpower is an established high-volume supplier in the cylindrical power-cell segment rather than a recent entrant.
Frequently Asked Questions
What is the capacity and voltage of the Tenpower 40XG?
The Tenpower 40XG has a nominal capacity of 4.0 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 Tenpower 40XG?
The Tenpower 40XG supports continuous discharge rates up to 90 A, delivering exceptional power density of 4,909 W/kg.
How much does the Tenpower 40XG weigh and what is its volume?
The cell has a mass of 66 g and a volume of 25.05 cm³.
In which industries is the Tenpower 40XG commonly used?
The Tenpower 40XG is used across aviation, motorsports, drones, and power tools, applications that demand both high energy and power density.
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.
