Focus On Solving Lithium Battery Pack Management Technology, A Industry Leader Since 2015 - Huawen.

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 1

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 2

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 3

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 4

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 5

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 6

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 7

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1

Custom 3.7V/5V/9V/12V/24V Lithium Battery Pack With Smart BMS

Model: 21700 2S1P Battery Pack
Battery cell type: NMC
Connection method: 2S1P
Capacity: 29.6Wh/7.4V4000mAh
Input: 8.4V
Output: 5.5V~4.2V25A, 30A(Max)
Weight: approx 150g
Cycle: more than 500 times at 80% DOD
Customized services:
MOQ 500 sets
√ Battery capacity/voltage/current
√ Brand / LOGO
√ Packaging method

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What Specifications Can Huawen Make？

We can provide all kinds of specifications,there is a part of us.

Model	21700Pack
Nominal voltage	3.6V (3.7V)	7.2V (7.4V)	10.8V (11.1V)	21.6V (22.2V)	36V (37V)
Nominal capacity	4000mAh/4200mAh/4500mAh/4800mAh/5000mAh
Battery pack	1S1P/2P/3P/4P/5P/......	2S1P/2P/3P/4P/5P/......	3S1P/2P/3P/4P/5P/.....	6S1P/2P/3P/4P/5P/.....	10S1P/2P/3P/4P/5P/.....
Input voltage	4.2V	8.4V	12.6V	25.2V	42V
Input current	1C	1C	1C	1C	1C
Output voltage（regular ver.)	2.75V~4.2V(WRV)	5.5V~8.4V(WRV)	8.25V~12.6V(WRV)	16.5V~25.2V(WRV)	27.5V~42V(WRV)
Output voltage（custom ver.)	5V/9V(CV)	5V/9V/12V(CV)	5V/9V/12V/24V(CV)	5V/9V/12V/24V/36V/48V(CV)	5V/9V/12V/24V/36V/48V(CV)
Continuous output current	1C~15C	1C~15C	1C~15C	1C~15C	1C~15C
Peak output current	3C~30C	3C~30C	3C~30C	3C~30C	3C~30C
PCM/BMS	OVP/UVP/OCP/OCC/OTP/TV/CVCC, etc.
Connector	ZH1.5mm/PH2.0mm/SH1.0mm/VH3.96/SM2.54/XH2.54, etc.
Battery type	NMC
Working temperature	Charge: 0~45℃ Discharge: -10~60 ℃
Cycle life	Around 300 times / 500 times
Warranty	12 Months
Application	Consumer electronics (electric toothbrushes, Bluetooth speakers, POS machines, etc.). Power tools (electric bicycles, electric motorcycles, electric cars, golf carts, handheld electric drills, etc.). Lamps (flashlights, LED flashlights, laser flashlights, engineering lighting lamps, mining lamps, emergency lights, etc.). Energy storage (home optical storage systems, UPS, base stations, computer room power supplies, clean energy storage, etc.).

1.Accurately adapt to 21700 ternary lithium battery pack solution

Carefully selected battery cells, dual guarantee of performance and safety

Battery cell core parameters

Single cell specifications: 21mm diameter × 70mm height, nominal voltage 3.6V~3.7V.

Capacity range: 4000mAh~5000mAh (supports 3C/5C/10C/11C/12C/13C/15C rate discharge, continuous discharge current 10A-60A).

Key performance: -40℃~80℃ wide temperature range operation, cycle life ≥500 times (80% capacity retention rate), in line with lightweight and cost-effective requirements.

Multi-scenario combination design

Consumer electronics: 1S-2S low string number solution (such as High power flashlight, Portable electronic cigarettes, Small portable power bank, etc).

Power tools: 3S-7S high power portable tool (brushless drill, Outdoor energy storage lamp, Professional camera, etc.).

High voltage power system: High rate discharge power receiving equipment (Electric bicycles, electric skateboards, industrial grade drones, etc).

Certification support

UN38.3 is standard, CE/ROHS/KC is optional, and global access for terminal products is supported.

Nominal voltage

3.7V

1S2P

1S3P

1S4P

Other

Nominal voltage

7.4V

2S1P

2S2P

2S3P

Other

Nominal voltage

11.1V

3S1P

3S2P

3S4P

Other

Nominal voltage

22.2V

25.9V

36V

We stock a range of standard Li-ion battery packs for a wide range of applications in the consumer and industrial markets. All of these lithium batteries have a PCM/BMS (Protection Control Module) to ensure safety.

If you require a quote for a Li-ion battery pack, or you cannot find the specific Li-ion battery pack you need on our website, please contact us.

2.Intelligent PCM/PCB/BMS customization:

precise control, double safety

Specially optimized for 21700 ternary lithium batteries

Hierarchical protection scheme

Basic version: overcharge (≤4.25V±0.05V)/overdischarge (≥2.5V±0.05V)/short circuit/overcurrent protection.

Enhanced version: 10K/100K NTC high-precision temperature monitoring (±1℃), single cell voltage balancing (balancing current 30-50mA).

High-end version: SOC estimation (accuracy ±5%), self-recovery fuse, historical fault recording function.

Communication protocol compatibility

Support UART, CAN, RS485 interface protocols, seamlessly connect industrial control equipment and IoT terminals.

Development efficiency

Provide standardized BMS modules and complete customized debugging in 7-10 days.

3.Connectors and wiring harnesses: professional matching of current and scenarios

Full coverage from micro devices to medium-power applications

Connector brands and types

Recommended brands: JST (XH/SH series), Molex (Micro-Fit 3.0), DC Plug, XT Plug, etc.

Special requirements: support waterproof type (IP67), anti-drop buckle design, gold-plated contacts (reduced impedance).

Customized wires

Wire diameter range: AWG10 (high current power line) ~ AWG26 (signal line).

Wire type: silicone wire (bending resistance 100,000 times), Teflon wire (high temperature resistance 150℃).

Wire length can be freely defined: 50mm (embedded) to 2m (external device), supporting color coding.

Development efficiency

Provide standardized BMS modules and complete customized debugging in 7-10 days.

4. Appearance packaging: flexible choice of structure and materials

From industrial-grade protection to extreme lightweight

Shell material and process

Flame retardant material options: ABS/PC material, UL94 V0/V1/V2 flame retardant grade optional.

Custom plastic mold: customers can provide plastic mold design, or we can open mold on demand.

Custom silicone mold: food-grade silicone shell (Shore hardness 30A-80A), suitable for medical/wearable devices.

Structural design optimization

Compact solution: battery pack thickness <22mm (2S1P bare package).

Heat dissipation enhancement: optional metal heat sink embedded or shell hollow design.

5. Packaging and labeling: safe delivery and brand penetration

Full-link value-added from production end to user end

Professional protective packaging

Finished product packaging: blister lining + corrugated paper box, anti-drop height ≥1.2m.

Custom plastic mold: customers can provide plastic mold design, or we can open mold on demand.

Custom silicone mold: food-grade silicone shell (Shore hardness 30A-80A), suitable for medical/wearable devices.

Compliance identification system

Mandatory identification: voltage, capacity, polarity, fire protection identification (UL/IEC standards).

Smart label: optional QR code to achieve production batch traceability.

Brand appearance design

Shell LOGO process: laser engraving, silk screen printing, embossing (depth 0.2mm-0.5mm)Packaging.

Box customization: support Pantone color matching and corporate slogan printing.

If you require a quote for a Li-ion battery pack, or you cannot find the specific Li-ion battery pack you need on our website, please contact us.

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 28

Customizable 2S1P 7.4V 4000mAh 30A Discharge Lithium-ion Battery Pack for LED Light/High Brightness Flashlight1 29

Questions About Product

Our in-house designers and engineers have produced countless great designs for customers from different industries

What kind of cooperation methods can you provide?

We can provide OEM/ODM customization services and provide customers with brand new labeling brands for sales. Of course, we also welcome partners from various countries and regions to sign agency cooperation agreements with us.

Q: Can I Have A Sample Order?

A: Yes, we welcome sample order to test and check quality.

Q: Do you have a MOQ limit?

A: Yes, our MOQ for bulk orders is 500 pcs. The MOQ for customized appearance is 2,000 pcs.

Q: Can I get a lower price if I order a large quantity of products?

A: Yes, the price of the product is cheaper if you order more quantities.

Q: Can I get the pre-production sample ?

Yes, we will ask for your requirements and provide solutions before production. We will produce samples for you upon your approval.

Q: How long is delivery time ?

A: Normally 15-20 working days after receiving your payment.

Q: How about warranty?

A: 1 year warranty.

We are looking forward to get more cooperation

Our team provides excellent customer service and support

● 24*7 fast response

● Provides technical assistance

● After-sales support

● Delivery time for sample orders is 15-25 days

● Delivery time for bulk orders is 25-30 days

Get in touch or visit us