Cylindrical 21700 High-Power Cell
Enpower Greentech 21700-4.5Ah
High-power cylindrical 21700 cell delivering 4.4 Ah capacity with 230 Wh/kg energy density and 60 A maximum discharge rate.
Overview
The Enpower Greentech INR21700-4.5Ah is a high-power lithium-ion cylindrical 21700 cell designed for applications that demand sustained high current and high energy density. Released in 2025 and with the manufacturer based in China, this cylindrical 21700 cell delivers 4.4 Ah capacity and 15.84 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 60 A, making it well suited to high-power systems operating under aggressive load profiles.
Key Features
High discharge rate: 60 A continuous (13.6 C)
Energy density: 230 Wh/kg
Power density: 3130 W/kg
Cathode: Ni-based
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Enpower Greentech
Model
INR21700-4.5Ah
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2025
Nominal voltage
3.6
Energy capacity [Wh]
15.84
Capacity [Ah]
4.4
Gravimetric energy density [Wh/kg]
230
Gravimetric power density [W/kg]
3130
Max continuous discharge [A]
60
Volume [cm³]
25.57
Mass [g]
69
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Graphite/Si additive
Value
Applications & Use‑Cases
The Enpower Greentech 21700-4.5Ah 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 Enpower Greentech 21700-4.5Ah across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access Enpower Greentech 21700-4.5Ah constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not 21700-4.5Ah data.)
Constant Current Temperature
Access Enpower Greentech 21700-4.5Ah thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not 21700-4.5Ah data.)
Pulse Power Behaviour
Access Enpower Greentech 21700-4.5Ah pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not 21700-4.5Ah data.)
Dynamic Profile Response
Access Enpower Greentech 21700-4.5Ah 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 21700-4.5Ah 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 Enpower Greentech 21700-4.5Ah with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Enpower Greentech
Enpower Greentech is an American developer of lithium-metal and solid-state cells
Enpower Greentech was founded in California in 2012 and develops lithium-metal and all-solid-state batteries alongside the key materials they depend on. Its research and manufacturing centres are based in China and Japan, with further operations in the United States and Germany. The company produces lithium-metal pouch cells at energy densities well beyond conventional graphite-anode lithium-ion, including some of the lightest high-capacity lithium-metal cells built to date, aimed at uncrewed aircraft and other endurance-limited platforms. Its technical programme has drawn on collaborations with academic groups in the United States and Japan, and the company is venture backed. Enpower sits among the developers moving lithium-metal chemistry from demonstrators into qualified production cells.
Frequently Asked Questions
What is the capacity and voltage of the Enpower Greentech 21700-4.5Ah?
The Enpower Greentech 21700-4.5Ah has a nominal capacity of 4.4 Ah and a nominal voltage of 3.6 V, providing 15.84 Wh of energy per cell.
What is the maximum continuous discharge capability of the Enpower Greentech 21700-4.5Ah?
The Enpower Greentech 21700-4.5Ah supports continuous discharge rates up to 60 A, delivering exceptional power density of 3,130 W/kg.
How much does the Enpower Greentech 21700-4.5Ah weigh and what is its volume?
The cell has a mass of 69 g and a volume of 25.57 cm³.
In which industries is the Enpower Greentech 21700-4.5Ah commonly used?
The Enpower Greentech 21700-4.5Ah is used across eVTOL, motorsports, drones, and e-mobility, 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.
