Steel-shell 21700 battery 3500~5000mAh
irayenergy steel-shell 21700 lithium-ion batteries (3500–5000mAh) are designed for high-performance applications, offering both large capacity and high energy density. With mature manufacturing processes and excellent consistency, they are ideal for assembling multi-cell series and parallel battery modules. Whether for the high-intensity operation of power tools or long-duration power supply in energy storage systems, these 21700 batteries provide reliable, stable, and efficient energy support.
FAQs
What is a Steel-shell 21700 Lithium-ion Battery?
A 21700 battery is a cylindrical lithium-ion battery with a diameter of 21mm and a length of 70mm, enclosed in a steel shell. Compared with 18650 batteries, a 21700 battery has a larger single-cell capacity, offering higher energy density and longer runtime.
Why choose 21700 batteries with 3500~5000mAh capacity?
The 3000~5000mAh capacity range balances high energy density with high discharge performance. It ensures sufficient runtime in high-power applications while reducing the number of cells in series within a battery pack, directly lowering assembly complexity and cost.
What are the advantages of 21700 batteries in power tools?
Compared with 18650 batteries, 21700 cells offer higher energy density and support longer continuous high-rate discharge, suitable for high-power tools such as drills, saws, and electric wrenches. The steel shell provides excellent impact and compression resistance, ensuring safety and reliability in demanding operating conditions.
What advantages does this battery offer for electric vehicles?
The 21700 battery has high capacity and good thermal management, making it suitable for assembling large-capacity battery modules. It meets electric vehicles’ requirements for range and high-power acceleration. Its standardized size and high consistency also facilitate battery pack design and production.
How does a steel-shell 21700 battery differ from pouch or prismatic batteries?
Steel-shell 21700 batteries feature high mechanical strength, impact resistance, and excellent consistency, making them suitable for large-scale assembly. Compared to pouch cells, they are sturdier with better heat resistance and short-circuit protection; compared to prismatic cells, their manufacturing process is mature with higher automation efficiency.
How does the weight of a 21700 battery compare to an 18650 battery?
The 21700 battery has a larger capacity and is slightly heavier than an 18650 battery, typically around 68–75g. However, its energy-to-weight ratio is better, making it more suitable for high-energy-density applications.
Does a steel-shell 21700 battery heat up during high-rate discharge?
High-rate discharge generates heat, but the steel-shell battery has low internal resistance and good thermal conductivity, which helps manage temperature rise effectively.
Can this battery be used in high-power portable devices?
Yes. With large capacity and strong discharge capability, the 21700 battery is ideal for high-power portable devices such as high-performance power tools, electric skateboards, and electric bicycles.
How efficient is assembling steel-shell 21700 batteries in energy storage systems?
Due to standardized size and high consistency, 21700 batteries allow efficient large-scale assembly. They reduce the number of cells in series by about 30% compared with 18650, lowering wiring complexity and assembly cost.
Can steel-shell 21700 batteries be used in series and parallel to form battery packs of various voltages and capacities?
Yes. Their standardized size and high consistency make 21700 batteries very suitable for assembling battery packs of various voltages (12V–100V) and capacities (a few Ah to hundreds of Ah) across different applications.
