Pouch Cell
SES H4M
Pouch cell delivering 4.2 Ah capacity with 373 Wh/kg energy density and 29.4 A maximum discharge rate.
Overview
The SES H4M is a lithium-metal pouch cell designed for applications that demand reliable performance across a broad range of load conditions. With the manufacturer based in the United States, this pouch cell delivers 4.2 Ah capacity and 16 Wh of energy at a nominal voltage of 3.82 V, with a maximum continuous discharge capability of 29.4 A, making it suitable for applications that balance runtime against peak power demand. Its 373 Wh/kg gravimetric energy density is above the pouch median of 341 Wh/kg in the About:Energy battery library.
Key Features
Discharge rate: 29.4 A continuous (7.0 C)
Energy density: 373 Wh/kg
Power density: 2,612 W/kg
Cathode: Ni-based
Applications: drones, aviation, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
SES
Model
H4M
Type
Li Metal
Form factor
Pouch
Country of origin
United States
Release year
2026
Nominal voltage
3.82
Energy capacity [Wh]
16.044
Capacity [Ah]
4.2
Gravimetric energy density [Wh/kg]
373
Gravimetric power density [W/kg]
2612
Max continuous discharge [A]
29.4
Volume [cm³]
22.5404
Mass [g]
43
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Lithium Metal
Value
Applications & Use‑Cases
The SES H4M is well suited to the following applications due to its pouch form factor and balanced performance.
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.
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.
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 H4M across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access SES H4M constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not H4M data.)
Constant Current Temperature
Access SES H4M thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not H4M data.)
Pulse Power Behaviour
Access SES H4M pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not H4M data.)
Dynamic Profile Response
Access SES H4M 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 H4M 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 H4M 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 H4M?
The SES H4M has a nominal capacity of 4.2 Ah and a nominal voltage of 3.82 V, providing 16 Wh of energy per cell.
What is the maximum continuous discharge capability of the SES H4M?
The SES H4M supports continuous discharge rates up to 29.4 A, delivering a power density of 2,612 W/kg.
How much does the SES H4M weigh and what is its volume?
The cell has a mass of 43 g and a volume of 22.5 cm³.
In which industries is the SES H4M commonly used?
The SES H4M is used across drones, aviation and e-mobility, applications that demand reliable performance and balanced energy and power.
How does the SES H4M compare with the Advantelec 3S340-4.4?
Comparing the SES H4M with the Advantelec 3S340-4.4: capacity 4.2 Ah against 4.4 Ah; maximum continuous discharge 29.4 A against 13.2 A; energy density 373 Wh/kg against 306 Wh/kg; mass 43 g against 51 g. Both datasheets can be compared side by side in The Voltt.
What chemistry and format is the SES H4M?
The SES H4M is a pouch cell with a Ni-based cathode and a Lithium Metal anode. It has a nominal voltage of 3.82 V and a volume of 22.5 cm³. Its full datasheet is free to view in The Voltt.
