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Cylindrical - Model 21700
21700 3.7V 5,000mAh Lithium-ion Cell
- Cell Type
- Cylindrical
- Nominal Voltage
- 3.7V
- Rated Capacity
- 5,000mAh
- Size
- 21700 single cell
- Cycle Life
- ≥ 800 cycles (80% retention)
- Connector
- XT60 / JST / customizable
Application Guide
21700 Lithium Battery Cell for High-Energy Pack Design
21700 lithium cells are widely used in modern cylindrical battery packs because they provide higher capacity per cell than 18650 formats while keeping pack design compact. They are suitable for power tools, e-mobility, robotics and other applications where energy density and assembly efficiency matter.
Typical Applications
- Power-tool battery packs
- E-bike, scooter and light mobility packs
- Robotics and high-energy portable devices
- Custom cylindrical lithium battery packs
Custom Battery Options
- Single-cell sourcing or complete pack assembly
- Series/parallel configuration for voltage and capacity targets
- High-current BMS and thermal design support
- Connector, cable, housing and label customization
Related buying guides
Technical Data
Specifications
Model 21700
Features
21700
- A-grade lithium-ion cells, high consistency
- Long cycle life ≥ 800 cycles
- Wide operating temperature -20°C ~ 60°C
- Smart BMS with multiple safety protections
- Customizable wiring, connectors and housing
OEM / ODM
Customization options
We design custom battery packs from 10 mAh to 100 kWh. Send us your requirements — our engineers reply within 24 hours.
Request a custom quote →- Capacity customization
- Connector customization
- PCM / BMS customization
- Cable length customization
- Logo printing
- Battery pack assembly
Frequently Asked Questions
Is 21700 better than 18650?+
For many new pack designs, 21700 cells provide higher capacity per cell and can reduce the number of cells, welds and balancing points in the pack.
Can BLUS ENERGY build custom 21700 battery packs?+
Yes. We can design series/parallel 21700 battery packs with BMS, connectors, cables, housing and certification support.
How do I request a product quote and sample?+
Fill in the form on the Contact page or email us at info@blusenergy.com. Please include voltage, capacity, dimensions, usage scenario, target certifications and required quantity. Our engineers will respond within 24 hours.
What is the product minimum order quantity (MOQ)?+
Standard cells: MOQ 500 pcs. Customized battery packs: MOQ 100 pcs for prototyping, 1,000 pcs for mass production. Smaller quantities can be discussed.
Which international safety certifications do your battery products carry?+
IEC62133, UN38.3, MSDS, CE, RoHS, UL2054, UL9540, IEC62619, KC, BIS, PSE, CB, ISO9001, ISO14001. We can also arrange additional certifications on request.
How long do sampling and bulk delivery each take?+
Standard products: 7–15 days. Customized packs: 15–25 days for samples, 25–45 days for mass production (depending on certification and tooling).
What is the official warranty period for all battery products?+
12 months for consumer cells, 24 months for industrial packs, up to 10 years for energy storage systems (subject to project scope).
Do you provide installation guidance and technical support for energy storage systems?+
Yes. For BESS and household storage we provide installation manuals, remote training, on-site commissioning (paid) and 24/7 ticket support.
Get a Quote - 21700
We design custom battery packs from 10 mAh to 100 kWh. Send us your requirements — our engineers reply within 24 hours.