The ASOL21700-2S is a cylindrical Li-ion battery pack built on a 2S1P architecture — two 21700 cylindrical cells in series, delivering 7.4V nominal voltage, 5000mAh capacity and 37Wh total energy. Selected 21700 cells can provide higher capacity per cell than many conventional 18650 cells, helping reduce cell count in suitable pack designs. Final performance depends on the selected cell model, discharge rate and thermal design.
With 7.4V output, the ASOL21700-2S hits the sweet spot for a wide range of consumer and industrial applications: cordless power tools (drills, screwdrivers, grass trimmers), handheld vacuum cleaners and cordless home appliances, portable power banks and backup battery devices, small electric mobility (scooters, balance bikes), and outdoor lighting equipment (flashlights, camping lanterns). The higher voltage compared to single-cell 3.7V packs delivers more torque for motors and brighter output for lighting.
At the core of every pack is an integrated BMS (Battery Management System) that continuously monitors cell-level voltage, current, and temperature — providing multi-layer protection against overcharge, over-discharge, overcurrent, short circuit, and thermal runaway. Every unit ships from our quality-controlled production facility after passing full inspection: individual cell voltage matching (±10mV tolerance), complete charge/discharge cycle verification, and BMS functionality testing.
Technical Specifications
| Parameter | Value |
|---|---|
| Chemistry | cylindrical lithium-ion (21700 cells) |
| Model | ASOL21700-2S |
| Configuration | 2S1P (2 Series, 1 Parallel) |
| Nominal Voltage | 7.4V |
| Capacity | 5000mAh |
| Energy | 37Wh |
| Charging Voltage | 8.4V (CC/CV) |
| Standard Discharge Current | 0.2C (1000mA) |
| Max Continuous Discharge | 2C (10A) |
| BMS Protection | Overcharge / Over-discharge / Overcurrent / Short circuit / Temperature monitoring / Cell balancing |
| Standard Connector | JST (custom connectors available) |
| Cycle Life | ≥500 cycles @ 80% capacity retention (0.5C, 25°C) |
| Operating Temperature | 0°C to +60°C (charge: 0°C to +45°C) |
| Dimensions | Approx. 75 × 40 × 22 mm (excluding wires & connector) |
| Weight | Approx. 145g |
| Certifications | CE, RoHS, UN38.3, MSDS |
| Manufacturer | ASOLENERGY TECHNOLOGY (Dongguan, China) |
Available Connector Options
| Connector | Description | Best For |
|---|---|---|
| JST-PH 2.0 (Default) | 2-pin, white connector | General purpose, consumer electronics |
| JST-XH 3-pin | Balance charge connector | 2S balance charging |
| Molex | 1.25mm pitch | Consumer electronics, IoT |
| XT60 | Mid-size gold bullet | Mid-size ESC, up to 60A |
| EC5 | High-current banana | RC & power tools |
| Custom | Your specification | OEM/ODM projects (MOQ applies) |
Applications
Where the 21700 2S is used
7.4V torque for drills, screwdrivers & grass trimmers.
Slim 2S1P fit for handheld vacuums, fans & air pumps.
37Wh building block for high-capacity portable backup battery.
Custom pack designs for approved low-voltage mobility systems.
5000mAh runtime for tactical flashlights & camping lanterns.
21700 and 18650 Cell Selection
Selected 21700 cells can provide higher capacity per cell than many conventional 18650 cells, helping reduce cell count in suitable pack designs. Final performance depends on the selected cell model, discharge rate and thermal design.
Cell format should be selected against the target voltage, runtime, enclosure space, discharge current, thermal design and qualified supply options. ASOL reviews these factors before confirming a pack configuration.
- 21700 cells can be suitable where higher capacity per cell and fewer cells support the required pack design.
- 18650 cells remain suitable for many compact, cost-sensitive and established pack designs.
- Final performance is validated against the selected cells, BMS, wiring, charger and operating conditions.
Why ASOL
Factory-direct, fully customizable
Connector, wire gauge, heat-shrink color, custom brand label, BMS & housing.
Integrated PCB against overcharge, over-discharge, overcurrent & short circuit.
Grade-A cells, voltage-matched ±10mV for stable, reliable performance.
Selected sample support is subject to specification review and product availability. Sample freight is paid by the customer.
Every unit tested for OCV, capacity & protection. Defect rate <0.3%.
UN38.3 Class 9 air & sea · DHL/FedEx/UPS · EXW/FOB/CIF/DDP.
Packaging & Shipping
| Item | Details |
|---|---|
| Individual Packaging | Anti-static bag + foam cushion inside individual box |
| Inner Box | 20 pcs / inner box |
| Carton | 100 pcs / carton (customizable) |
| Carton Dimensions | Approx. 42 × 32 × 24 cm (subject to final packing) |
| Carton Weight | Approx. 16-8 kg |
| Shipping Options | Express (DHL / FedEx / UPS), Air freight, Sea freight |
| Shipping Terms | EXW, FOB, CIF, DDP available |
| Dangerous Goods | UN38.3 certified — compliant for air and sea transport (Class 9) |
| Lead Time (Samples) | Confirmed after specification review |
| Lead Time (Bulk) | 15-25 business days after sample confirmation |
| Payment Terms | T/T, PayPal, Western Union |
Frequently Asked Questions
Can I customize the connector and wire specifications?
Yes. We support JST, Molex, JST-PH, XT60, EC5, and other industry-standard connectors. Wire gauge, length, and polarity are all customizable to match your device interface. Just send us your pinout diagram or sample connector.
What is the minimum order quantity (MOQ)?
Standard configurations start at 50 pcs. For fully custom designs, MOQ is 100-500 pcs depending on complexity. Sample development may be available for selected cylindrical battery projects, subject to specification review and product availability. Sample freight is paid by the customer.
Is the ASOL21700-2S suitable for cordless power tool manufacturers?
Absolutely. The 7.4V voltage and 5000mAh capacity are ideal for medium-power cordless tools such as electric drills, screwdrivers, and grass trimmers. The 21700 cell format delivers higher energy density and better thermal performance than traditional 18650-based packs.
What certifications are available?
All standard packs ship with CE, RoHS, UN38.3, MSDS compliance.
Can the ASOL21700-2S be used for e-scooter and e-bike battery packs?
Standard battery packs should not be connected in series or parallel without engineering confirmation. The BMS, charger, wiring and pack-matching requirements must be designed for the target system.
What is the difference between 21700-2S and 18650-2S battery packs?
21700 and 18650 formats have different dimensions and available cell specifications. Selected 21700 cells can offer higher capacity per cell in suitable designs, while final runtime, discharge performance and thermal behavior depend on the selected cell model and complete pack design.
Contact
| Channel | Details |
|---|---|
| info@asolbattery.com | |
| +86 157 7985 8703 | |
| Website | www.asolbattery.com |
| Response Time | Within 24 hours on working days |
Sample availability and timing: confirmed after specification review. Sample freight is paid by the customer. Bulk production: confirmed with the approved project specification.
Ready to upgrade your product line with high-performance 21700 battery packs?
Send us your application details, target quantity, and any custom requirements — we will respond within 24 hours with a factory-direct quote and project review.
Need a different size or capacity? Explore ASOL’s full cylindrical battery pack range →
