The ASOL21700-2S is a premium-grade cylindrical Li-ion battery pack built on a 2S1P architecture — two high-capacity 21700 cylindrical cells in series, delivering 7.4V nominal voltage with 5000mAh capacity and 37Wh total energy. The 21700 cell format (21mm diameter × 70mm length) offers approximately 35% higher energy density than standard 18650 cells, making this pack the ideal upgrade for manufacturers seeking longer runtime and greater power output in medium-voltage applications.
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.
Series-connect packs for scooters, balance bikes & e-bikes.
5000mAh runtime for tactical flashlights & camping lanterns.
Why Choose 21700-2S Over 18650-2S?
The 21700 cell format is rapidly replacing 18650 as the industry standard for medium-voltage battery packs. Here is a side-by-side comparison:
| Feature | 21700-2S (This Product) | 18650-2S |
|---|---|---|
| Capacity | 5000mAh | 2600-3500mAh |
| Energy | 37Wh | 19.2-25.9Wh |
| Cell Diameter | 21mm | 18mm |
| Cell Length | 70mm | 65mm |
| Weight | ~145g | ~90g (lower) |
| Energy Density | ~35% higher per cell | Standard |
| Thermal Performance | Better heat dissipation | Standard |
| Supply Chain | Future-proof (Tesla, DeWalt) | Mature but declining |
| Cycle Life | ≥500 cycles | ≥500 cycles |
Choose 21700-2S when: You need maximum runtime, higher energy density, and future-proof supply chain for power tools, e-mobility, and high-drain portable devices.
Choose 18650-2S when: Lower weight and cost are priorities, and the application doesn’t require the highest energy density.
- 35% More Energy per Cell — 21700 cells store up to 5000mAh vs. 2600-3500mAh for 18650, delivering significantly longer runtime in the same 2S voltage platform.
- Better High-Rate Performance — The larger cell format handles higher discharge currents with less heat buildup, ideal for power tools and high-lumen lighting.
- Improved Thermal Management — Greater surface area dissipates heat more effectively, enabling sustained high-power output without thermal throttling.
- Future-Proof Supply Chain — Major OEMs (Tesla, Milwaukee, DeWalt) have committed to 21700, ensuring long-term availability and competitive pricing.
- Compact Pack Design — Fewer cells needed for equivalent capacity means smaller, lighter battery packs with simplified BMS requirements.
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.
Custom prototype samples in 5–7 business days before volume production.
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) | 5-7 business days after payment |
| 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 orders of 1-10 pcs are welcome for evaluation.
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?
Yes. The 7.4V nominal voltage is well-suited for small e-mobility. Multiple packs can be connected in series (2S2P = 14.8V, 3S2P = 22.2V) for larger e-bike or scooter systems.
What is the difference between 21700-2S and 18650-2S battery packs?
The 21700-2S uses 21700 format cells (21mm × 70mm) which offer approximately 35% higher energy density than 18650 cells (18mm × 65mm). A 21700-2S 5000mAh pack delivers significantly more runtime than an 18650-2S pack of the same voltage, while maintaining similar or better discharge performance and thermal characteristics.
Contact
| Channel | Details |
|---|---|
| info@asolbattery.com | |
| +86 157 7985 8703 | |
| Website | www.asolbattery.com |
| Response Time | Within 24 hours on working days |
Sample lead time: 5-7 business days Bulk production: 15-25 business days Payment terms: T/T, PayPal, Western Union
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 competitive factory-direct quote and sample development arrangement.
Need a different size or capacity? Explore ASOL’s full cylindrical battery pack range →
