Cylindrical - Model 21700-2S
Custom 7.4V 5000mAh 21700 2S Battery Pack
- Cell Type
- Cylindrical
- Nominal Voltage
- 7.4V
- Rated Capacity
- 5,000mAh
- Size
- 21700 cells · 2S1P
- Rated Energy
- 37Wh
- Limited Charging Voltage
- 8.4V
Application Guide
21700 2S1P Battery Pack Design for Custom Applications
This 7.4V 5000mAh battery pack uses the confirmed 2S1P configuration: two 21700 cells are connected in series to set the pack voltage, with one cell path in parallel. The 21700 format provides a larger cylindrical cell envelope than 18650, so cell-format selection should consider the available enclosure space as well as the required capacity and load profile. BMS, connector and cable requirements can be matched to the OEM equipment.
Typical Applications
- OEM equipment requiring a 7.4V cylindrical pack
- Power tools with a compatible load profile
- E-mobility equipment with confirmed space and current needs
- Custom applications designed around a two-cell 21700 layout
Custom Battery Options
- BMS matched to continuous and peak current requirements
- Connector type, pinout and wiring configuration
- Cable length and routing for the enclosure
- Pack integration based on available installation space
Manufacturer / OEM
Choosing Between 21700 and 18650 for a 2S Pack
A 21700 cell has a larger physical format than an 18650 cell and can provide more capacity per cell, while 18650 may suit a narrower layout. The correct choice depends on enclosure geometry, capacity target, continuous current and peak current. Share those requirements so the cell format, BMS and wiring can be reviewed together.
Related buying guides
Technical Data
Specifications
Model 21700-2S
Features
21700-2S
- 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
Applications
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
What does 2S1P mean for this 21700 battery pack?+
Two 21700 cells are connected in series to provide the 7.4V nominal voltage, and the single parallel path means the pack uses one cell in each series position.
Can the BMS, connector and cable be customized?+
Yes. BLUSENERGY can review the BMS requirements, connector, pinout, wiring and cable length for the confirmed OEM equipment specification.
What load information is needed for integration?+
Provide the continuous current, peak current and peak duration, along with the enclosure space and required connector, so the pack can be evaluated for the application.
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.
