Precision-built lithium battery packs using high-quality 18650 cells, custom BMS, and certified for safety—engineered to power your tools, mobility devices, and energy storage systems.
As a professional 18650 lithium battery pack manufacturer, Junda delivers high-performance custom solutions tailored to your exact specifications. Whether for e-bikes, energy storage, tools, or medical devices, our team ensures every pack is safe, efficient, and reliable.
Do you need a battery pack built with 18650 cells? We offer end-to-end support—from cell chemistry analysis to BMS development and precision pack assembly—covering a wide range of industrial applications.
Our technical team brings over 15 years of hands-on experience in 18650 cell integration and pack architecture. We design each pack for optimal balance between capacity, safety, and lifecycle.
We tailor every BMS according to your project’s voltage, current, and protocol requirements. You can even specify component brands for ICs, MOSFETs, and protection circuits to align with your performance or sourcing standards.
Every pack undergoes cell matching, insulation testing, temperature monitoring, and cycle verification. We ensure uniform resistance, stable output, and long-term reliability—all in line with ISO and UN38.3 standards.
With streamlined workflows and in-house capabilities, we accelerate your development timeline without compromising on quality—ideal for fast-moving product cycles or urgent OEM requirements.
We design and manufacture custom lithium battery packs tailored to your exact specifications—from high-power cylindrical cells to solid-state and waterproof modules.
Voltage: 11.1V
Application: ROV/Outdoor Camera/SolarStreet Lights
Capacity: Custom design as your needs
Voltage: 14.8V
Application: Military Equipment/MedicalDevices
Warranty: One year
Voltage: 22.2V
Application: Power Tool/LightingEquipment/Drone
Cycles: 300-500 times DOD 80%
Voltage: 25.2V /25.9V
Application: Golf Trolley/ElectricBike/Fishing Tools
Cycles: 300-500 times DOD 80%
Voltage: 36V/37VApplication: Golf Trolley/E-bike/CleaningEquipment
Cycles: 300-500 times DOD 80%
Voltage: 46.8V/48.1V
Capacity: custom design
Cell:186502600mAh/2900mAh/3350mAh/3500mAh
We support nominal voltages from 11.1V (3S) to 48.1V (13S), and capacity from 2Ah to over 40Ah, depending on the parallel configuration and your specific application.
Yes. You can specify Samsung, LG, Panasonic, or other branded/unbranded cells. We can also make recommendations based on your performance, budget, and certification needs.
Absolutely. All packs come with a Battery Management System—ranging from basic protection to advanced smart BMS with UART, CAN, or Bluetooth communication.
We offer UN38.3, CE, RoHS, and MSDS by default. For high-compliance markets, we also support IEC 62133, UL, and third-party lab testing if required.
For most custom 18650 battery packs, the MOQ starts at 100 units, depending on the complexity and casing. Sample orders are available for testing before mass production.
Yes. We support custom housings, including triangle, rack-mount, or shrink-wrapped packs. Our engineers can also adjust wire exit locations, connector types, and mounting holes.
Sample time: 7–10 days
Bulk production: 20–25 days
Shipping: Express, air, or sea—based on your timeline and budget
Yes. We provide 1-year warranty and technical support via email, phone, or video call. If any issue arises, we help identify the cause and provide replacements or repairs if applicable.
Everything you need to know before choosing a custom 18650 battery pack—from how they work and how they’re built, to what features, specifications, and safety tests matter. This guide walks you through the core technical, customization, and application insights so you can make confident, informed sourcing decisions for your project.
18650 lithium battery packs remain a cornerstone of modern energy systems. With a mature supply chain, standardized cylindrical format, and excellent balance between energy density and safety, 18650 cells are still widely used across industries—even as newer formats emerge.
For B2B buyers, 18650 battery packs offer three critical advantages:
Proven Reliability – 18650 cells have been tested in everything from laptops to electric vehicles over decades. Their thermal stability and predictable cycle life make them ideal for applications requiring consistent performance.
Flexible Customization – From 12V to 72V systems, 18650 packs can be configured into a wide range of voltages and capacities. Combined with advanced BMS and modular casing designs, they suit custom applications perfectly.
Global Availability – Thanks to mass production by top-tier brands like Samsung, LG, and Panasonic, 18650 cells are easy to source, cost-efficient, and supported by robust quality standards.
Whether you’re building e-bikes, robotics systems, power tools, or energy storage units, a custom lithium-ion cylindrical battery pack built with 18650 cells offers a scalable and dependable energy solution.
18650 battery packs are built by combining cylindrical cells in different series and parallel arrangements. These configurations directly determine the working voltage, capacity, and size of the final battery pack.
How Series and Parallel Work
Series (S): Increases voltage.
Example: 13 cells in series (13S) × 3.7V = 48.1V
Parallel (P): Increases capacity.
Example: 4 cells in parallel (4P) × 2.5Ah = 10Ah
A 13S4P pack = 48V 10Ah.
👉 Most 18650 battery packs are configured for 24V, 36V, or 48V systems. We do not recommend exceeding 13S (48V) with 18650 cells due to thermal and safety limitations.
| Configuration | Nominal Voltage | Typical Application |
|---|---|---|
| 3S1P – 3S4P | 11.1V | Communication devices, compact tools |
| 4S1P – 4S4P | 14.8V | Medical devices, portable instruments |
| 6S2P – 6S4P | 22.2V | Drones, mobile inspection systems |
| 7S3P | 25.9V | Light electric mobility |
| 10S4P | 37V | E-bikes, scooters |
| 13S4P | 48.1V | Power tools, robotics |
18650 cells come in multiple lithium-based chemistries. Each has trade-offs in energy density, safety, cost, and lifecycle. Choosing the right one is key to your application’s success.
| Chemistry | Nominal Voltage | Energy Density | Thermal Safety | Lifespan | Use Case |
|---|---|---|---|---|---|
| NCM / NCA | 3.6–3.7V | High | Moderate | 500–800 cycles | High-power tools, e-bikes |
| LFP (LiFePO₄) | 3.2V | Medium | Very High | 2000+ cycles | Energy storage, backup power |
| LCO | 3.6V | High | Low | 300–500 cycles | Consumer electronics |
Chemistry Selection Tips
Choose NCM/NCA if you need high energy in a small space (e.g., mobility).
Choose LFP if you prioritize safety, thermal resistance, and long service life.
Match the chemistry with BMS protection logic and charger specs for optimal performance.
Every project has unique energy, size, and safety requirements. That’s why we offer full customization of 18650 battery packs—from core electrical parameters to housing design, BMS integration, and external connectors. You get exactly what your application needs.
Electrical Customization
Voltage Options:
Configurable from 11.1V (3S) to 48.1V (13S), depending on your load requirement.
Capacity Range:
From 2Ah to 40Ah+ via parallel configurations.
Discharge Current:
Adjustable based on application—continuous and peak discharge settings are engineered with proper wire gauge and protection logic.
BMS (Battery Management System)
We provide multiple BMS solutions:
Basic BMS for standard overcharge/discharge protection
Smart BMS with:
UART / CAN communication
Bluetooth diagnostics
Active cell balancing
Data logging and remote monitoring (optional)
All BMS units are tuned to match the pack’s configuration and chemistry.
Casing & Structural Options
We support both standardized and custom pack formats:
Shrink-wrapped soft packs (for tight spaces)
Hard plastic enclosures (triangle, rear rack, rectangle)
Aluminum housings (for heat-sensitive environments)
Waterproof & dustproof options (IP54/IP65)
Packs can be made to fit your product housing, including mounting slots, cable exits, or internal compartments.
Connectors & Wiring
XT60 / XT90
DC5.5, Anderson, T-plug
Custom wire lengths and terminals
Charging and load ports can be split or combined
All cables are UL-certified, and we provide assembly drawings for review before production.
Custom Branding & Labels
Need OEM services? We support:
Custom logo stickers or engraved plates
Serial number tracking
QR codes for traceability
Packaging with your brand guidelines
From cell layout to firmware protocols, we tailor every aspect of the battery pack to your project specs. Whether you’re developing a next-gen mobility device or a rugged custom lithium power solution, our engineering team ensures seamless integration with your product.
Every 18650 battery pack is built with multi-layer protection to ensure electrical safety, mechanical integrity, and long-term reliability.
Cell Matching & Sorting
18650 cells are screened and grouped based on voltage, capacity, and internal resistance. This reduces the risk of cell imbalance and overheating.
Spot or Laser Welding
We apply low-resistance welding methods to assemble nickel connections with high strength and minimal heat impact—ideal for cylindrical 18650 cells.
BMS Installation & Protection Logic
All 18650 battery packs are equipped with a matched BMS to control:
Overcharge / Over-discharge
Short-circuit protection
Temperature sensor response
Optional communication protocols (UART, CAN, Bluetooth)
Structural Safety
Packs include flame-retardant insulation, EVA padding, and internal bracing to protect against drops and vibration—essential for mobile 18650-based systems.
We conduct rigorous testing on every 18650 battery pack before shipment to ensure consistent quality, safety, and field-readiness.
| Test Item | Purpose |
|---|---|
| Voltage & Capacity Check | Validates usable energy and individual 18650 cell integrity |
| Internal Resistance Measurement | Ensures balanced discharge rates across 18650 cells |
| Charge / Discharge Cycle Test | Monitors long-term performance under real use cycles |
| Short-Circuit Simulation | Tests BMS protection response for 18650 packs |
| Vibration / Drop Test | Verifies mechanical durability for shipping & usage |
| Insulation Resistance | Protects against electrical leakage and internal arcing |
| Temperature Stress Test | Assesses 18650 battery performance in heat/cold conditions |
We help you maintain full control and compliance across every 18650 battery pack delivered.
Unique Serial Numbers
Each 18650 pack is labeled with a traceable ID and batch code.
QC Documentation
Our team documents all assembly steps and testing data for internal control and customer reference.
Certificate of Conformance (CoC)
Issued on request to validate each 18650 battery pack meets your technical specs and global standards.
Long-Term Traceability
All data is stored securely for up to 5 years, enabling fast diagnostics, warranty support, or product recall tracebacks if needed.
Our traceability system ensures your brand stays protected and your supply chain remains accountable.
Understanding the core specifications of 18650 battery packs helps ensure compatibility with your device, system, or design. Below is a typical range of technical parameters we support. All values are customizable based on your exact requirements.
| Parameter | Specification Range | Remarks |
|---|---|---|
| Cell Type | 18650 Cylindrical Li-ion | Samsung, LG, Panasonic, or custom brand |
| Nominal Voltage | 11.1V – 48.1V | 3S to 13S configuration |
| Capacity | 2Ah – 40Ah+ | Adjustable by parallel connection (P) |
| Discharge Current | 5A – 50A | Custom continuous/peak settings |
| Cycle Life | 500 – 1000 cycles | Based on DOD & cell chemistry |
| BMS | Basic / Smart (UART, CAN, BT) | Supports balancing & fault protection |
| Operating Temperature | -20°C to 60°C | Custom thermal padding available |
| Casing Options | Shrink-wrap, Plastic, Aluminum | Optional waterproof/dustproof enclosure |
| Connector Types | XT60, Anderson, DC plug, custom | Input/output can be combined or split |
| Certifications | UN38.3, CE, RoHS, MSDS | Additional test reports on request |
18650 battery packs are compact, energy-dense, and widely adaptable—making them a top choice across dozens of industries. From mobility to industrial tools, these packs deliver the power and reliability professional buyers demand.
18650 battery packs (36V/48V) are the backbone of most lightweight electric mobility systems. Ideal for daily commuting, rental fleets, and personal transportation Supports high discharge rates and extended range Smart BMS integration for real-time monitoring
Compact 18650 packs are used in drills, saws, lawn trimmers, and more. Delivers burst current up to 30A Designed for shock, drop, and rapid charge/discharge Rugged casing and thermal protection
Autonomous robots and mobile systems require stable, long-lasting energy storage. Custom-shaped packs for compact integration CAN/UART communication with onboard control systems Long cycle life for continuous operation
Used in home power banks, sensors, surveillance devices, and solar storage. Low standby loss and excellent thermal behavior LFP or low-drain chemistry options available Compatible with solar charging controllers
Reliable energy is essential for portable medical diagnostics and testing tools. Certified for transport safety (UN38.3, MSDS) Flame-retardant enclosures available Stable output in temperature-sensitive environments
We offer free design consultations to recommend the right 18650 battery pack structure for your specific application and housing requirements.
Choosing the right 18650 battery pack supplier is not just about price—it’s about engineering trust, consistent quality, and long-term support. Here’s why B2B buyers in mobility, medical, and industrial sectors partner with us.
1. Engineering Expertise
10+ years of experience in lithium battery design and manufacturing
In-house R&D for custom pack design, thermal protection, and smart BMS integration
Capable of handling complex requests: curved housings, CAN/UART protocols, smart data logging
2. Scalable Manufacturing Capacity
7+ production lines dedicated to 18650 packs
Monthly capacity: 100,000+ units
Fast lead time: 7–10 days for sampling, 20–25 days for bulk orders
Real-time order tracking and flexible logistics support
3. Full Customization Support
Customized voltage, current, casing, wire length, and connector type
Logo labeling, QR code, serialization, and brand packaging available
OEM/ODM service with NDA protection for private designs
4. Quality Assurance & Global Compliance
100% functional testing before shipment
Certifications available: UN38.3, CE, RoHS, MSDS
Full traceability system with serial number tracking and batch inspection reports
Support for third-party testing and market-specific certifications (e.g. IEC 62133)
5. Long-Term Partnership Approach
1-on-1 technical communication
Multi-language support (EN, DE, JP, CN)
Dedicated after-sales team for warranty & troubleshooting
Design improvement suggestions based on your application feedback
As your dedicated battery pack OEM/ODM supplier, we help bring your product vision to life with certified, custom-engineered 18650 battery packs.
Custom 18650 battery packs remain a trusted power solution across industries thanks to their compact size, high energy density, and proven reliability. Whether you need a 36V e-bike battery, a high-discharge pack for power tools, or a smart BMS-enabled module for robotics, our engineering team can tailor a solution to match.
We support flexible voltage and capacity combinations, branded cell sourcing, advanced protection systems, and application-specific housing designs. All packs are built with safety-first protocols and tested to meet international standards.
If you’re looking for a long-term manufacturing partner who understands the balance of performance, safety, and scalability in lithium battery pack production—we’re ready to power your next innovation.
With more than a decade of experience, Junda delivers precision-engineered lithium battery packs tailored for your unique applications. Here’s what makes us a trusted partner for global B2B clients:
At Junda, our engineering team is led by a senior battery architect with 15+ years of hands-on experience at CATL, BYD, and other industry leaders. Backed by a cross-functional team of 6 engineers, we provide full-cycle development from design and simulation to testing and certification. We’ve completed over 1,000 custom battery pack projects across sectors like eMobility, energy storage, medical devices, and industrial tools—always focusing on safety, reliability, and performance.
Junda operates under a strict ISO 9001:2015-certified quality management system, overseen by our QA director and implemented across every department. From incoming cell inspection to final pack aging tests, every step is digitally tracked and traceable. Our system ensures stable supply chain sourcing, controlled assembly processes, and compliance with industry benchmarks such as UN38.3, CE, and IEC 62133.
Junda’s battery pack assembly process integrates mechanical, electrical, and thermal design tailored to your use case. Our capabilities include IP67/IP68 waterproof housing, high-discharge BMS systems, CAN/RS485 communication protocols, and reinforced designs for vibration or extreme environments. We conduct cell sorting, welding, insulation, balancing, and aging tests in-house to ensure consistent performance and longevity.
From your first inquiry to final delivery, we provide responsive, multilingual support backed by a dedicated sales and engineering team. We guide clients through technical evaluation, prototyping, compliance, and logistics—ensuring a transparent, stress-free experience. Whether you need an urgent sample or a long-term OEM solution, we’re here to make your battery development process efficient and reliable.
Share your voltage, size, application, and quantity needs—we’ll assess your project quickly.
Our engineers will optimize the design, confirm details, and provide samples if needed.
Once approved, we start production and arrange fast, secure shipping to your destination.
Need a custom lithium battery pack? Just send us your specs—we’ll help you choose the right voltage, case, and configuration for your application.
At JUNDA, we make customization easy. Follow these 3 simple steps to start today:
Send your battery requirements — voltage, capacity, casing type, or upload drawings/photos.
We’ll evaluate your specs and recommend the best configuration. A detailed quote will be sent within 24 hours.
After approval and deposit, we start production. Shipping and tracking will be arranged for fast, secure delivery.
