Cylindrical 21700 High-Power Cell
V4Smart UHP-26
Cylindrical 21700 cell delivering 2.6 Ah capacity, 136 Wh/kg energy density and 100 A maximum discharge rate.
Overview
The V4Smart UHP-26 is a high-power Li-ion cylindrical 21700 cell designed for applications that demand sustained high current. Released in 2025 and with the manufacturer based in Germany, this cylindrical 21700 cell delivers 2.6 Ah capacity and 9.62 Wh of energy at a nominal voltage of 3.7 V, with a maximum continuous discharge capability of 100 A, making it well suited to high-power systems. At 38.5 C its continuous discharge capability is high for a cell of this capacity class.
Key Features
Extremely high discharge rate: 100 A continuous (38.5 C)
Energy density: 136 Wh/kg
Power density: 5248 W/kg
Capacity: 2.6 Ah nominal capacity
Applications: drones, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
V4Smart
Model
V21700 UHP-26
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
Germany
Release year
2025
Nominal voltage
3.7
Energy capacity [Wh]
9.62
Capacity [Ah]
2.6
Gravimetric energy density [Wh/kg]
136
Gravimetric power density [W/kg]
5248
Max continuous discharge [A]
100
Volume [cm³]
24.65
Mass [g]
70.5
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Value
Applications & Use‑Cases
The V4Smart UHP-26 is well suited to the following applications due to its 21700 format and high power 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.
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 V4Smart UHP-26 across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The V4Smart UHP-26 constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The V4Smart UHP-26 constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The V4Smart UHP-26 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 V4Smart UHP-26 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 V4Smart UHP-26 with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
V4Smart
V4Smart is a German ultra-high-power cylindrical cell manufacturer
V4Smart is a German cell manufacturer based in Nördlingen, formed from VARTA AG's V4Drive business after Porsche AG acquired a majority stake in March 2025. The company builds ultra-high-power cylindrical lithium-ion cells in the 21700 format for applications where sustained discharge rate is the binding constraint. Its V21700 UHP-26 is in series production and powers the Porsche 911 Carrera GTS, one of the few high-performance automotive programmes running on a dedicated high-power cell. A second-generation cell pairs a silicon-based anode using Group14's SCC55 material with the existing high-power architecture, reaching roughly 3.7 Ah at 277 Wh/kg while holding power density near 2.73 kW/kg. V4Smart occupies an unusual niche in serving performance automotive and motorsport directly, rather than adapting mass-market EV cells to high-rate duty.
Frequently Asked Questions
What is the capacity and voltage of the V4Smart UHP-26?
The V4Smart UHP-26 has a nominal capacity of 2.6 Ah and a nominal voltage of 3.7 V, providing 9.62 Wh of energy per cell.
What is the maximum continuous discharge capability of the V4Smart UHP-26?
The V4Smart UHP-26 supports continuous discharge rates up to 100 A, delivering a power density of 5248 W/kg.
How much does the V4Smart UHP-26 weigh and what is its volume?
The cell has a mass of 70.5 g and a volume of 24.65 cm³.
In which industries is the V4Smart UHP-26 commonly used?
The V4Smart UHP-26 is used across drones, motorsports, e-mobility, applications that demand sustained high current.
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.
