A 21700 battery pack is useful when the device needs higher energy density but still requires a custom shape, BMS and connector. Compared with many 18650 layouts, 21700 cells may reduce cell count and simplify internal connection.
Best-Fit Applications
This page is suitable for OEM buyers developing robots, portable equipment, inspection devices or compact high-energy products. The final choice between 18650 and 21700 should be made after reviewing space, current, cost and supply stability.
Custom Design Notes
We can design the pack with cell holders, insulation, nickel strip or busbar connection, BMS protection, custom wiring and export packaging.
Basic Specification Range
| Voltage | 7.4V to 96V |
| Capacity | 5Ah to 300Ah |
| Chemistry | 21700 Li-ion |
| Application | robotics, portable equipment, inspection devices and high-energy OEM products |
| Certification Support | UN38.3, MSDS and CE support |
Related Custom Battery Support
For the full engineering process, visit our custom battery pack page. You can compare existing models in the battery product catalog, review industry use cases under battery solutions, or send your project details through Contact us.
FAQ
Why choose 21700 cells?
They can offer higher capacity per cell and may reduce the number of cells in the pack.
Is 21700 always better than 18650?
No. It depends on pack shape, current, availability and cost target.
Can this pack support high current?
Yes, if high-current cells and a suitable BMS are selected.
Can the enclosure be custom made?
Yes. Plastic, metal, shrink-wrapped or waterproof structures can be designed.
What is needed before sampling?
Voltage, capacity, size limit, current, connector and application information are needed.