Cylindrical 21700 High-Power Cell
Reliance RS50
High-power cylindrical 21700 cell delivering 5 Ah capacity with 269 Wh/kg energy density and 70 A maximum discharge rate.
Overview
The Reliance INR21700-RS50 is a high-power Li-ion cylindrical 21700 cell designed for applications that demand sustained high current and high energy density. Manufactured in china, this cylindrical 21700 cell delivers 5 Ah capacity and 18 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 70 A, making it well suited to high-power systems operating under aggressive load profiles.
Key Features
Extremely high discharge rate: 70 A continuous (14.0 C)
Energy density: 269 Wh/kg
Power density: 3761 W/kg
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Reliance
Model
INR21700-RS50
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2024
Nominal voltage
3.6
Energy capacity [Wh]
18
Capacity [Ah]
5
Gravimetric energy density [Wh/kg]
269
Gravimetric power density [W/kg]
3761
Max continuous discharge [A]
70
Volume [cm³]
25.18
Mass [g]
67
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Value
Applications & Use‑Cases
The Reliance RS50 is well suited to the following applications due to its cylindrical 21700 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 Reliance RS50 across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
The Reliance RS50 constant-current plots reveal voltage behaviour under steady loads, ideal for analysing efficiency.
Constant Current Temperature
The Reliance RS50 constant-current plots reveal temperature behaviour under steady loads, ideal for analysing thermal response.
Pulse Power Behaviour
The Reliance RS50 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 Reliance RS50 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 Reliance RS50 with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Reliance
Reliance is a battery manufacturer producing cylindrical lithium-ion cells
Reliance New Energy is developing lithium-ion battery manufacturing capabilities as part of India's growing energy storage and electric vehicle ecosystem. Their entry into 21700 cylindrical cell production represents India's strategic push toward domestic battery manufacturing self-sufficiency. Reliance leverages its industrial infrastructure and investment capacity to establish advanced battery production facilities targeting India's expanding EV market and energy storage requirements. The company's battery strategy encompasses technology partnerships, materials sourcing, and manufacturing localization to reduce import dependence. Reliance's 21700 cells aim to meet automotive specifications for Indian and global markets, supporting the country's electrification goals. As India emerges as a significant battery market, Reliance's manufacturing capabilities position them as a key domestic supplier for electric mobility transformation.
Frequently Asked Questions
What is the capacity and voltage of the Reliance RS50?
The Reliance RS50 has a nominal capacity of 5.0 Ah and a nominal voltage of 3.6 V, providing 18 Wh of energy per cell.
What is the maximum continuous discharge capability of the Reliance RS50?
The Reliance RS50 supports continuous discharge rates up to 70 A, delivering exceptional power density of 3,761 W/kg.
How much does the Reliance RS50 weigh and what is its volume?
The cell has a mass of 67 g and a volume of 25.18 cm³.
In which industries is the Reliance RS50 commonly used?
The Reliance RS50 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 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.
