Cylindrical - Model 21700
21700 3.7V 5000mAh Lithium-ion Cell
- Cell Type
- Cylindrical
- Nominal Voltage
- 3.7V
- Rated Capacity
- 5,000mAh
- Size
- 21700 single cell
- Rated Energy
- 18.5Wh
- Limited Charging Voltage
- 4.2V
Application Guide
Single 21700 Cell for Custom Battery Pack Integration
This product is a single 3.7V 5000mAh 21700 cylindrical lithium-ion cell, not a multi-cell battery pack. The 21700 designation describes its cylindrical cell size format. The cell can be evaluated for custom battery pack integration based on the project's target voltage, capacity, load requirements and available installation space.
Typical Applications
- Power-tool projects with confirmed electrical requirements
- Consumer products designed around the 21700 format
- OEM battery pack integration projects
Custom Battery Options
- Pack layout based on confirmed project requirements
- Protection and BMS integration review
- Connector, cable and wiring requirements
- Housing or enclosure integration
Manufacturer / OEM
Information Needed for a Custom 21700 Battery Project
Provide the target pack voltage, target capacity, load requirement, peak load requirement, available installation space, connector requirement and cable or wiring requirement. These inputs allow the pack layout, protection and mechanical integration to be evaluated without assuming a series or parallel configuration.
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
Need a different capacity, size, connector or battery configuration? Send us your requirements and our engineers will evaluate a suitable solution for your project.
Request a custom quote →- Capacity customization
- Connector customization
- PCM / BMS customization
- Cable length customization
- Logo printing
- Battery pack assembly
Frequently Asked Questions
Is this 21700 product a single cell or a battery pack?+
It is a single 3.7V 5000mAh 21700 cylindrical lithium-ion cell, not a finished multi-cell battery pack.
Can this 21700 cell be integrated into a custom battery pack?+
Yes. The project can be evaluated based on the target voltage, capacity, load, protection approach, connector, wiring and available installation space. The final pack configuration must be confirmed for the specific project.
What information is needed for a custom 21700 battery project?+
Provide the target voltage, capacity, load requirement, peak load requirement, available space, connector requirement and cable or wiring requirement.
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)?+
MOQ depends on the battery model and customization requirements. Sample and prototype quantities can be discussed based on your project needs. Send us your specifications and estimated quantity, and we’ll evaluate the most suitable option for your project.
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.
