Cylindrical 21700 High-Power Cell
Reliance RP70
Cylindrical 21700 cell delivering 7 Ah capacity and 21 A maximum discharge rate.
Overview
The Reliance RP70 is a lithium-ion cylindrical 21700 cell designed for applications that demand reliable performance and consistent capacity delivery. Released in 2026 and with the manufacturer based in China, this cylindrical 21700 cell delivers 7 Ah capacity and 25.2 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 21 A, making it well suited to energy-focused applications requiring extended runtime.
Key Features
High discharge rate: 21 A continuous (3.0 C)
Charging rate: 1.0 C charging rate
Applications: aviation, motorsports, e-mobility
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Reliance
Model
INR21700-RP70
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2026
Nominal voltage
3.6
Energy capacity [Wh]
25.2
Capacity [Ah]
7
Gravimetric energy density [Wh/kg]
Gravimetric power density [W/kg]
Max continuous discharge [A]
21
Volume [cm³]
Mass [g]
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Value
Applications & Use‑Cases
The Reliance RP70 is well suited to the following applications due to its cylindrical 21700 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 Reliance RP70 across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access Reliance RP70 constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not RP70 data.)
Constant Current Temperature
Access Reliance RP70 thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not RP70 data.)
Pulse Power Behaviour
Access Reliance RP70 pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not RP70 data.)
Dynamic Profile Response
Access Reliance RP70 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 RP70 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 Reliance RP70 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 Chinese manufacturer of high-power cylindrical lithium-ion cells
Reliance is a Chinese cell manufacturer producing cylindrical lithium-ion cells in the 21700 format, built on a tabless electrode architecture that lowers internal resistance and improves heat rejection under sustained load. Its RS and RP model codes denote the high-rate and high-capacity lines, with the trailing figure indicating rated capacity. The cells are aimed at electric bicycles and light electric vehicles, karting and motorsport, power tools and other applications where continuous discharge rather than pack energy sets the requirement. The company entered the market recently and competes directly with the established high-power cylindrical suppliers. Its relevance lies in bringing tabless construction to a competitive price point.
Frequently Asked Questions
What is the capacity and voltage of the Reliance RP70?
The Reliance RP70 has a nominal capacity of 7 Ah and a nominal voltage of 3.6 V, providing 25.2 Wh of energy per cell.
What is the maximum continuous discharge capability of the Reliance RP70?
The Reliance RP70 supports continuous discharge rates up to 21 A.
How much does the Reliance RP70 weigh and what is its volume?
Physical dimensions are not specified for this cell.
In which industries is the Reliance RP70 commonly used?
The Reliance RP70 is used across aviation, motorsports, e-mobility, applications that demand high power delivery and reliable performance across demanding duty cycles.
What is The Voltt and how does it accelerate cell evaluation?
The Voltt holds 500+ verified commercial cell datasheets alongside validated simulation models built from cells characterised in About:Energy's own lab. Engineers screen candidates against their real duty cycle before buying hardware, which cut cell evaluation time by seven months for McMurtry Automotive and reduces evaluation cycles by up to 70%.
What data can be extracted using The Voltt?
Constant-current discharge curves at multiple C-rates, DC internal resistance against state of charge and temperature, pulse power maps, thermal response, and full mission-profile simulation with user-defined pack configurations. Models are available as equivalent circuit, thermal, physics-based and degradation formats, exportable for use in MATLAB, Simulink and Python workflows.
