Cylindrical 21700 High-Power Cell
Rincell RC58
Cylindrical 21700 cell delivering 5.8 Ah capacity, 292 Wh/kg energy density and 17.4 A maximum discharge rate.
Overview
The Rincell RC58 is a high-power Li-ion cylindrical 21700 cell designed for applications that demand sustained high current. Released in 2026 and with the manufacturer based in United States, this cylindrical 21700 cell delivers 5.8 Ah capacity and 20 Wh of energy at a nominal voltage of 3.45 V, with a maximum continuous discharge capability of 17.4 A, making it well suited to high-power systems. Among the 21700 cylindrical cells in the About:Energy battery library, the Rincell RC58 ranks 14th of 97 for gravimetric energy density. Its 292 Wh/kg compares with a 21700 cylindrical median of 257 Wh/kg.
Key Features
High discharge rate: 17.4 A continuous (3.0 C)
Energy density: 292 Wh/kg
Power density: 876 W/kg
Capacity: 5.8 Ah nominal capacity
Applications: aviation, e-mobility, motorsports
Technical Specifications from the Manufacturer
Parameter
Manufacturer
Rincell
Model
INR21700RC58
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
United States
Release year
2026
Nominal voltage
3.45
Energy capacity [Wh]
20.01
Capacity [Ah]
5.8
Gravimetric energy density [Wh/kg]
292
Gravimetric power density [W/kg]
876
Max continuous discharge [A]
17.4
Volume [cm³]
25.49
Mass [g]
68.5
Positive electrode (cathode)
Negative electrode (anode)
Value
Applications & Use‑Cases
The Rincell RC58 is well suited to the following applications due to its 21700 format 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.
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.
Motorsports: Demands sustained high discharge under competitive load profiles, rapid transient response for acceleration, and thermal stability to maintain performance during race conditions.
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 Rincell RC58 across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access Rincell RC58 constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not RC58 data.)
Constant Current Temperature
Access Rincell RC58 thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not RC58 data.)
Pulse Power Behaviour
Access Rincell RC58 pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not RC58 data.)
Dynamic Profile Response
Access Rincell RC58 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 RC58 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 Rincell RC58 with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
Rincell
Rincell is an American silicon-graphite lithium-ion and sodium-ion cell manufacturer
Rincell is a battery developer headquartered in San Francisco, California, producing cylindrical cells built on silicon-graphite anodes. Its RC series covers the 18650 and 21700 formats in both energy-led and high-rate versions, engineered for fast charging, long cycle life and operation across a wide temperature range, including well below freezing. The company has added high-power sodium-ion cells for applications where cost and low-temperature behaviour outweigh energy density. Rincell is commissioning cell manufacturing in California to supply customers that require domestic production. Its position rests on moving silicon-bearing anodes into commercial volumes in conventional cylindrical formats rather than bespoke ones.
Frequently Asked Questions
What is the capacity and voltage of the Rincell RC58?
The Rincell RC58 has a nominal capacity of 5.8 Ah and a nominal voltage of 3.45 V, providing 20 Wh of energy per cell.
What is the maximum continuous discharge capability of the Rincell RC58?
The Rincell RC58 supports continuous discharge rates up to 17.4 A, delivering a power density of 876 W/kg.
How much does the Rincell RC58 weigh and what is its volume?
The cell has a mass of 68.5 g and a volume of 25.5 cm³.
In which industries is the Rincell RC58 commonly used?
The Rincell RC58 is used across aviation, e-mobility, motorsports, applications that demand sustained high current.
How does the Rincell RC58 compare with the BAK 58E?
Comparing the Rincell RC58 with the BAK 58E: capacity 5.8 Ah against 5.6 Ah; maximum continuous discharge 17.4 A against 11.2 A; energy density 292 Wh/kg against 280 Wh/kg; mass 68.5 g against 74 g. Both datasheets can be compared side by side in The Voltt.
What chemistry and format is the Rincell RC58?
The Rincell RC58 is a cylindrical 21700 cell. It has a nominal voltage of 3.45 V and a volume of 25.5 cm³. Its full datasheet is free to view in The Voltt.
