As demand for lightweight and high-performance battery solutions continues to grow, energy density has become an important consideration in industries such as drones, robotics, electric aviation, and specialized equipment.
The 400Wh/kg 40Ah lithium battery cell is designed for applications where high specific energy, substantial capacity, and weight reduction are essential. With a nominal voltage of 3.5V and a rated capacity of 40Ah, this cell offers potential for advanced battery systems requiring a balance between energy storage and weight.
In this article, we will explore the technical specifications, key performance characteristics, and potential applications of this high-energy-density lithium battery cell.
1. 400Wh/kg 40Ah Lithium Battery Cell: Technical Specifications
Understanding battery specifications is essential when selecting a suitable lithium battery cell for a particular application.
This 40Ah lithium battery cell features a nominal voltage of 3.5V, a charging cut-off voltage of 4.30V, and flexible discharge capabilities for different operating conditions.
The following table provides an overview of its main technical specifications.
400Wh/kg 40Ah Lithium Battery Cell Parameters
| Parameter | Specification |
|---|---|
| Standard Capacity | 40Ah |
| Nominal Voltage | 3.5V |
| Nominal Energy | 140Wh (calculated) |
| Charging Cut-off Voltage | 4.30V |
| Discharging Cut-off Voltage | 2.50V (0°C < T ≤ 60°C) |
| Low-Temperature Discharging Cut-off Voltage | 2.00V (-40°C ≤ T ≤ 0°C) |
| Initial Impedance | ≤1.0mΩ |
| Max. Continuous Charging Current | 1.0C |
| Max. Continuous Discharging Current | 3.0C |
| Max. Pulse Discharging Current | 5.0C, >60s |
| Cycle Life | ≥80% capacity retention after 500 cycles |
| Cell Weight | 360±15g |
| Charging Temperature | -10°C to 55°C |
| Discharging Temperature | -40°C to 60°C |
| Relative Humidity | ≤85% RH |
Test Conditions:
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Standard capacity: 1/3C, 25±2°C.
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Initial impedance: 25±2°C, AC 1kHz.
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Cycle life: 0.5C charging / 1C discharging, 25±2°C.
2. Key Advantages of the 400Wh/kg 40Ah Lithium Battery Cell
High Specific Energy and Lightweight Design
Energy density measures how much electrical energy a battery can store relative to its weight. It is generally expressed in watt-hours per kilogram (Wh/kg).
For drones, mobile robots, and electric aviation equipment, battery weight directly affects operating time, payload capacity, and overall system efficiency.
With a rated capacity of 40Ah and a nominal voltage of 3.5V, this cell provides approximately 140Wh of nominal energy.
Based on its nominal weight of 360g, the calculated gravimetric energy density is approximately 388.9Wh/kg. Actual energy density should be confirmed through cell weight measurements and test reports.
A high specific energy design can help reduce battery weight while maintaining energy storage capacity, offering greater flexibility for lightweight battery system development.
40Ah Capacity for Advanced Battery Applications
The 40Ah capacity provides a substantial energy storage option for applications requiring longer operating periods and customized battery configurations.
Combined with a 3.5V nominal voltage, the cell can be integrated into different series and parallel configurations to meet specific voltage and capacity requirements.
3. 400Wh/kg 40Ah Lithium Battery Cell: Discharge Performance and Temperature Range
Discharge performance is another important factor when evaluating high-energy-density lithium battery cells.
This 40Ah cell supports a maximum continuous discharge rate of 3C, equivalent to 120A, and a maximum pulse discharge rate of 5C, equivalent to 200A, for more than 60 seconds under the specified conditions.
These capabilities provide flexibility for applications requiring sustained power output as well as short-duration peak power.
Another notable feature is its wide operating temperature range:
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Charging temperature: -10°C to 55°C.
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Discharging temperature: -40°C to 60°C.
The discharge cut-off voltage is 2.50V at temperatures above 0°C and up to 60°C, and 2.00V at temperatures from -40°C to 0°C.
This wide discharge temperature range makes the cell a potential option for equipment operating in demanding environmental conditions. Actual performance should be evaluated under the intended operating temperature and load.
4. 400Wh/kg 40Ah Lithium Battery Cell: Cycle Life and Long-Term Performance
For commercial and industrial applications, battery performance is not determined by initial capacity alone. Cycle life and capacity retention are also important considerations.
According to the supplied specifications, this 40Ah lithium battery cell achieves at least 80% capacity retention after 500 cycles, tested at 25±2°C with 0.5C charging and 1C discharging.
This means the cell retains at least 80% of its initial capacity after 500 cycles under the specified test conditions.
Actual cycle life may vary depending on charging and discharging rates, operating temperature, depth of discharge, and usage conditions.
5. Applications of the 400Wh/kg 40Ah Lithium Battery Cell
With its 40Ah capacity, high specific energy potential, and wide discharge temperature range, this lithium battery cell can be considered for several advanced applications.
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Drones and UAVs: Lightweight battery solutions can help improve flight endurance and payload flexibility for industrial and professional drones.
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Robotics: Potential applications include mobile robots and humanoid robots that require efficient energy storage and reduced battery weight.
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Electric Aviation: High-specific-energy cells offer potential for lightweight battery system development in eVTOL and other electric aviation applications.
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Specialized Equipment: Flexible battery configurations can support equipment with demanding energy and weight requirements.
Final application suitability should be evaluated based on power requirements, thermal management, system integration, and safety standards.
6. Customized 400Wh/kg 40Ah Lithium Battery Cell Solutions from Arosen Power
A high-performance battery cell is only one part of a complete battery solution. Different applications require different voltage levels, capacities, structures, and discharge characteristics.
As a battery manufacturer, Arosen Power provides customized battery solutions based on specific project requirements.
Our customization capabilities include:
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Series and parallel cell configurations
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Customized voltage and capacity
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Battery pack dimensions and structural design
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Discharge rate requirements
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Battery Management System (BMS) integration
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Customized connectors and wiring
From battery configuration and design to manufacturing, we aim to support customers in developing battery solutions for drones, robotics, electric aviation, and other industrial applications.
Conclusion: Choosing the Right 400Wh/kg 40Ah Lithium Battery Cell
The 400Wh/kg 40Ah lithium battery cell offers an attractive solution direction for advanced applications where energy density, capacity, and weight are important considerations.
With a 40Ah capacity, 3.5V nominal voltage, 3C continuous discharge capability, and a specified cycle life of 500 cycles with at least 80% capacity retention, this cell provides a technical foundation for exploring lightweight battery systems.
Arosen Power is committed to providing battery products and customized solutions to meet different project requirements.
Contact Arosen Power to discuss your battery requirements and explore customized lithium battery solutions for your next project.