Pouch High-Power Cell
SES H4AF
High-power pouch cell delivering 4.1 Ah capacity with 449 Wh/kg energy density and 49.2 A maximum discharge rate.
Overview
The SES H4AF is a high-power lithium-metal pouch cell designed for applications that demand sustained high current and high energy density. With the manufacturer based in the United States, this pouch cell delivers 4.1 Ah capacity and 15.7 Wh of energy at a nominal voltage of 3.82 V, with a maximum continuous discharge capability of 49.2 A, making it well suited to high-power systems operating under aggressive load profiles. Among the pouch cells in the About:Energy battery library, the SES H4AF ranks 6th of 104 for gravimetric energy density. Its 449 Wh/kg compares with a pouch median of 341 Wh/kg.
Key Features
High discharge rate: 49.2 A continuous (12.0 C)
Energy density: 449 Wh/kg
Power density: 5,385 W/kg
Cathode: Ni-based
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
SES
Model
H4AF
Type
Li Metal
Form factor
Pouch
Country of origin
United States
Release year
2026
Nominal voltage
3.82
Energy capacity [Wh]
15.662
Capacity [Ah]
4.1
Gravimetric energy density [Wh/kg]
449
Gravimetric power density [W/kg]
5385
Max continuous discharge [A]
49.2
Volume [cm³]
15.2581
Mass [g]
34.9
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Anode-free
Value
Applications & Use‑Cases
The SES H4AF is well suited to the following applications due to its pouch 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 SES H4AF across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access SES H4AF constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not H4AF data.)
Constant Current Temperature
Access SES H4AF thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not H4AF data.)
Pulse Power Behaviour
Access SES H4AF pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not H4AF data.)
Dynamic Profile Response
Access SES H4AF 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 H4AF 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 SES H4AF with similar Pouch cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
SES AI
SES AI is an American developer of lithium-metal and lithium-ion cells
SES AI was founded in 2012 as SolidEnergy Systems and is headquartered in Boston, Massachusetts, with operations in Singapore, Shanghai and South Korea. The company develops both lithium-metal and lithium-ion pouch cells, pairing them with electrolyte formulations identified through its own AI-driven materials discovery platform. Its cells serve uncrewed aerial systems, electric aviation and automotive development programmes where energy density is the binding constraint, and the company also licenses its materials discovery software to other manufacturers. SES AI is publicly listed and works with automotive partners on joint development. It sits among the small group of developers moving lithium metal from laboratory demonstration toward qualified production.
Frequently Asked Questions
What is the capacity and voltage of the SES H4AF?
The SES H4AF has a nominal capacity of 4.1 Ah and a nominal voltage of 3.82 V, providing 15.7 Wh of energy per cell.
What is the maximum continuous discharge capability of the SES H4AF?
The SES H4AF supports continuous discharge rates up to 49.2 A, delivering exceptional power density of 5,385 W/kg.
How much does the SES H4AF weigh and what is its volume?
The cell has a mass of 34.9 g and a volume of 15.3 cm³.
In which industries is the SES H4AF commonly used?
The SES H4AF is used across eVTOL, motorsports, drones, and e-mobility, applications that demand both high energy and power density.
How does the SES H4AF compare with the Amprius SA102?
Comparing the SES H4AF with the Amprius SA102: capacity 4.1 Ah against 4.3 Ah; maximum continuous discharge 49.2 A against 4.3 A; energy density 449 Wh/kg against 453 Wh/kg; mass 34.9 g against 33.1 g. Both datasheets can be compared side by side in The Voltt.
What chemistry and format is the SES H4AF?
The SES H4AF is a pouch cell with a Ni-based cathode and a Anode-free anode. It has a nominal voltage of 3.82 V and a volume of 15.3 cm³. Its full datasheet is free to view in The Voltt.
