Cylindrical 21700 Cell
BAK 58E
Cylindrical 21700 cell delivering 5.6 Ah capacity with 280 Wh/kg energy density and 11.2 A maximum discharge rate.
Overview
The BAK 58E is a high-energy lithium-ion cylindrical 21700 cell designed for applications that demand high energy density and extended runtime. Released in 2024 and with the manufacturer based in China, this cylindrical 21700 cell delivers 5.6 Ah capacity and 20.7 Wh of energy at a nominal voltage of 3.6 V, with a maximum continuous discharge capability of 11.2 A, making it well suited to energy-focused applications requiring extended runtime. At 280 Wh/kg, the 58E ranks among the highest gravimetric energy densities in the 21700 format within the Voltt library.
Key Features
Discharge rate: 11.2 A continuous (2.0 C)
Energy density: 280 Wh/kg
Power density: 545 W/kg
Applications: aviation, e-mobility, general applications
Technical Specifications from the Manufacturer
Parameter
Manufacturer
BAK
Model
N21700CH-58E
Type
Li-ion
Form factor
Cylindrical 21700
Country of origin
China
Release year
2024
Nominal voltage
3.6
Energy capacity [Wh]
20.7
Capacity [Ah]
5.6
Gravimetric energy density [Wh/kg]
280
Gravimetric power density [W/kg]
545
Max continuous discharge [A]
11.2
Volume [cm³]
26.24
Mass [g]
74
Positive electrode (cathode)
Ni-based
Negative electrode (anode)
Graphite/Si additive
Value
Applications & Use‑Cases
The BAK 58E is well suited to the following applications due to its cylindrical 21700 form factor and high energy density 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.
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 BAK 58E across key indicators, including constant current behaviour, rate capability, temperature dependence, and available power under representative drive cycle conditions.
Constant Current Voltage
Access BAK 58E constant-current discharge curves in Voltt to size your pack against the voltage window your system actually needs. (Chart shown is illustrative, not 58E data.)
Constant Current Temperature
Access BAK 58E thermal discharge data in Voltt to specify cooling and cell spacing before you commit to a pack layout. (Chart shown is illustrative, not 58E data.)
Pulse Power Behaviour
Access BAK 58E pulse power maps in Voltt to set peak current limits and parallel count for your worst-case load. (Chart shown is illustrative, not 58E data.)
Dynamic Profile Response
Access BAK 58E 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 58E 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 BAK 58E with similar Cylindrical 21700 cells offering comparable capacity and performance characteristics.
Model
Capacity
Max Discharge
Typical Use
Access Cell Data
Manufacturer Background
BAK
BAK Battery is a Chinese lithium-ion cell manufacturer producing cylindrical and prismatic formats
BAK Battery was founded in 2001 and is headquartered in Shenzhen, with its principal cell plants in Zhengzhou and Fuzhou. The company produces cylindrical 18650 and 21700 cells alongside prismatic and polymer formats, using both nickel-based and lithium iron phosphate chemistries. Its cells supply electric vehicles, light electric mobility, power tools, consumer electronics and backup energy storage, giving it volume across several high-turnover segments. BAK is vertically integrated across materials, cell production and pack assembly, and also operates a battery recycling business. Its relevance rests on long-running mass production in the established cylindrical formats and a cost position built on scale rather than novel chemistry.
Frequently Asked Questions
What is the capacity and voltage of the BAK 58E?
The BAK 58E has a nominal capacity of 5.6 Ah and a nominal voltage of 3.6 V, providing 20.7 Wh of energy per cell.
What is the maximum continuous discharge capability of the BAK 58E?
The BAK 58E supports continuous discharge rates up to 11.2 A, delivering a power density of 545 W/kg.
How much does the BAK 58E weigh and what is its volume?
The cell has a mass of 74 g and a volume of 26.2 cm³.
In which industries is the BAK 58E commonly used?
The BAK 58E is used across aviation, e-mobility, energy storage, applications that demand high energy density and consistent performance over extended cycles.
How does the BAK 58E compare with the LG Chem M58T?
Comparing the BAK 58E with the LG Chem M58T: capacity 5.6 Ah against 5.57 Ah; maximum continuous discharge 11.2 A against 12.5 A; energy density 280 Wh/kg against 273 Wh/kg; mass 74 g against 73.2 g. Both datasheets can be compared side by side in The Voltt.
What chemistry and format is the BAK 58E?
The BAK 58E is a cylindrical 21700 cell with a Ni-based cathode and a Graphite/Si additive anode. It has a nominal voltage of 3.6 V and a volume of 26.2 cm³. Its full datasheet is free to view in The Voltt.
