Explore our high-performance 21700 lithium-ion battery packs, available in 11.1V, 14.8V, 22.2V, 24V, 36V, 43.2V, 48V, and 52V. Designed for e-mobility, automation, and high-drain equipment, our packs feature smart BMS, certified safety, and flexible custom configurations.
At Junda Battery, we specialize in designing and assembling high-performance 21700 lithium-ion battery packs tailored to your specific voltage and use case. Our engineering team rigorously tests various 21700 cell models under high discharge loads and extreme temperature conditions to ensure reliable performance, long cycle life, and safety across demanding environments.
We provide custom 21700 battery pack solutions for a wide range of industrial and mobility applications, including:
Electric Bikes – Long-range, high-power packs for urban and off-road riding
Power Tools – Compact, high-drain solutions for cordless applications
Drones & UAVs – Lightweight and energy-dense packs for flight endurance
AGVs & Robots – Stable and smart-powered battery packs for automation
Medical Equipment – Certified, temperature-tolerant packs for healthcare use
Electric Surfboards – Waterproof, high-output packs for extreme conditions
Our engineering team brings over 15 years of experience in lithium battery integration, with deep technical know-how in 21700 cell configuration, heat management, and structural optimization. Each battery pack is designed to strike the right balance between energy density, safety, and lifespan—from concept to mass production.
We offer fully customized BMS solutions tailored to your voltage, current, and protocol needs—whether CANBus, UART, or RS485. You can also specify your preferred IC, MOSFET, or fuse brands to match sourcing preferences or regulatory standards, ensuring a fully aligned supply chain.
All 21700 battery packs undergo strict cell grading, resistance balancing, insulation testing, and thermal verification. We monitor cycle life and safety thresholds across batches to ensure consistent output. Each unit complies with ISO 9001, UN38.3, MSDS, and other relevant certifications for international export.
Thanks to our in-house assembly lines and streamlined QC process, we deliver prototype samples in as fast as 7 days, and mass production within 15–25 days. Perfect for OEMs and engineering teams under tight timelines, or brands scaling up quickly with private label 21700 solutions.
We design and manufacture custom lithium battery packs tailored to your exact specifications—from high-power cylindrical cells to solid-state and waterproof modules.
Compact 3S battery pack using high-capacity 21700 cells, ideal for portable devices, IoT systems, and low-power industrial equipment. Customizable in shape, capacity, and BMS integration.
This 4S 21700 Li-ion pack delivers stable 14.8V output for RC units, compact tools, and medical equipment. Offers longer runtime and enhanced thermal performance compared to 18650 solutions.
Built with 6S configuration, the 22.2V 21700 battery pack is optimized for drones, high-discharge tools, and robotic systems. Balances energy density and output efficiency with custom BMS options.
High-efficiency 7S pack ideal for industrial controllers, AGVs, and lightweight mobility devices. Offers reliable power and extended cycle life with smart protection features.
A versatile 10S 21700 Li-ion battery pack engineered for electric bikes, scooters, and power tools. Delivers high energy density, robust safety, and customizable output ratings.
This 12S lithium-ion battery pack provides precise 43.2V output for advanced robotics, automation, and performance-critical applications. Available with UART/CAN-based smart BMS.
A popular 13S pack for electric mobility—ideal for e-bikes, trikes, and cargo systems. Built with premium 21700 cells for long range, high current, and safe operation.
Powerful 14S battery solution using 21700 cells, designed for high-speed e-bikes, industrial robots, and heavy-load systems. Supports CANBus/UART protocols and waterproof casings.
Built with a 16S configuration, the 60V 21700 battery pack offers reliable output for electric scooters, trikes, and industrial vehicles. Supports high current discharge with smart BMS integration for safe, long-range use.
High-voltage 20S lithium-ion battery pack using premium 21700 cells, ideal for electric motorcycles, off-road e-bikes, AGVs, and industrial robots. Delivers up to 84V when fully charged, with optional smart BMS for safe, high-power applications.
21700 cells are larger and offer higher energy density than 18650, making them ideal for applications that require longer runtime, fewer cells, or better thermal management.
Yes. We support A-grade 21700 cells from brands like Samsung, LG, EVE, and Lishen. You can specify your preferred brand or let us recommend one based on your cost–performance needs.
Absolutely. We offer both hardware and smart BMS options with support for CAN, UART, RS485, Bluetooth, and custom firmware integration.
UN 38.3 is required for transport. Depending on the market, you may also need CE (EU), UKCA (UK), IEC 62133, MSDS, RoHS, or UL. We provide full support.
Samples: 7–12 working days
Mass production: 15–25 days
Lead time may vary based on complexity, cell availability, and customization level.
Yes. We offer small-batch prototyping (usually 5–100 pcs) to help you test form, fit, and function before scaling up.
Yes. We provide custom labels, logo printing, box packaging, and barcode integration to support your supply chain and brand visibility.
You should include target voltage, capacity, discharge current, size limits, connector type, BMS protocol, certification needs, and annual quantity estimates.
From cell selection to compliance, this guide helps B2B buyers customize reliable 21700 battery packs for global applications.
In recent years, 21700 lithium-ion battery packs have gained widespread adoption in OEM applications across e-mobility, automation, medical, and industrial sectors. Compared to the traditional 18650 format, 21700 cells offer higher energy density, improved thermal performance, and longer cycle life, making them a preferred choice for B2B buyers with performance-critical requirements.
For businesses sourcing custom lithium battery packs, 21700 cells strike a practical balance between size, power, and efficiency. Whether you’re developing an electric bike, a delivery robot, or a smart medical device, a well-designed 21700 battery pack can help you:
Reduce battery footprint while extending runtime
Handle higher discharge currents for power-hungry systems
Improve thermal stability and reduce failure risks
Enable long-term durability in demanding environments
By partnering with a manufacturer that specializes in custom 21700 battery packs, OEM buyers gain the flexibility to tailor specifications—voltage, capacity, BMS protocol, housing, and even connector types—to meet exact system requirements.
While both 18650 and 21700 lithium-ion cells are widely used in custom battery packs, each format serves different needs. For many OEM projects, 21700 battery packs are the better choice—especially when power density, efficiency, and long-term cost-performance are priorities.
Here’s when switching to a 21700 Li-ion pack makes more business and technical sense:
When Your Product Requires Higher Energy in Limited Space
21700 cells offer approximately 35–50% more capacity per cell than 18650, reducing the total number of cells required to achieve the same output—perfect for space-constrained designs like compact e-bikes, drones, or handheld industrial tools.
When You Need Better Heat Management Under High Load
With a larger surface area and lower internal resistance, 21700 cells perform better under high current discharge, resulting in lower heat generation and improved safety margins—ideal for robots, mobility devices, or power tools that draw continuous current.
When You Want to Simplify Pack Design and Reduce Component Count
Fewer cells mean fewer weld points, tabs, and potential failure points. This leads to faster assembly, lower manufacturing costs, and higher structural stability over time—critical in long-life OEM products.
When Battery Lifecycle Is a Major Cost Factor
With greater capacity and better thermal control, 21700 battery packs often last longer per charge cycle, which translates into fewer replacements, lower TCO (total cost of ownership), and better user experience in field-deployed systems.
If your project involves long-range, high-drain, or heat-sensitive applications, a custom 21700 Li-ion battery pack may provide better overall performance, lifecycle economics, and product reliability than 18650.
Choosing the right voltage configuration is critical to how your 21700 battery pack performs in the field. At Junda, we offer custom 21700 Li-ion packs across a wide range of voltage options—each designed to meet specific power, runtime, and size requirements in real-world applications.
Below is a breakdown of our most requested voltage configurations and their typical B2B use cases:
| Voltage | Configuration | Typical Application |
|---|---|---|
| 11.1V | 3S | Medical monitors, handheld devices, IoT sensors |
| 14.8V | 4S | RC systems, low-power robotics, portable electronics |
| 22.2V | 6S | Drones, power tools, mobile scanners |
| 24V | 7S | AGV drives, medical pumps, industrial controllers |
| 36V | 10S | Electric bikes, scooters, warehouse robots |
| 43.2V | 12S | Performance tools, autonomous carts, smart machinery |
| 48V | 13S | E-mobility vehicles, delivery trikes, marine gear |
| 52V | 14S | High-speed e-bikes, off-road scooters, robotics |
| 60V | 16S | Electric mopeds, utility scooters, robotic arms |
| 72V | 20S | Electric motorcycles, heavy AGVs, surfboards |
How to Choose the Right Voltage?
When selecting voltage, consider:
Motor or device voltage rating (usually ±10% tolerance)
Required torque or output power
Pack size and weight limitations
Runtime expectations per charge
Thermal and enclosure design constraints
📌 Tip: Don’t just copy what competitors use—align the battery specs with your device’s actual power curves and load profile. Our engineering team can help you analyze requirements during the design phase.
One of the biggest advantages of choosing a custom 21700 battery pack is flexibility. Unlike off-the-shelf batteries, OEM packs can be engineered around your product’s exact voltage, current, safety, and integration needs. This not only enhances performance but also ensures compliance with your mechanical, electrical, and regulatory requirements.
Here are the main customization options you can expect when working with a professional lithium battery pack supplier:
1. Cell Brand and Grade
You can specify A-grade 21700 cells from trusted brands such as Samsung, LG, Lishen, EVE, or select cost-efficient alternatives for secondary markets. All cells can be matched by capacity, resistance, and production date to ensure uniform pack behavior.
2. Voltage, Capacity & Configuration
Choose your ideal voltage (e.g., 36V, 48V, 72V)
Define capacity targets via series/parallel layout (e.g., 13S4P, 20S5P)
Match the output power and runtime with your load profile
3. BMS Type and Protocol
We support:
Basic BMS: Overcharge/discharge, short-circuit, temp protection
Smart BMS: Advanced features like CANBus, UART, RS485, remote diagnostics, Bluetooth app monitoring
You may even request specific IC or MOS brands to comply with procurement or certification needs.
4. Connectors & Wiring
You can select from:
XT60, XT90, Anderson, Molex, or custom terminal blocks
Silicone or PVC wiring with your preferred gauge and length
This ensures your pack connects seamlessly to your controller or motor system.
5. Casing and Enclosure
Options include:
PVC shrink-wrap for internal use or compact devices
Plastic or aluminum housings for structural protection
IP-rated waterproof enclosures for outdoor and rugged environments
6. Labeling & Packaging
Your logo, model number, QR code, and warning labels can be printed or engraved. You can also customize box design, padding, and barcode systems for retail, industrial, or fulfillment logistics.
Pro Tip for Buyers: Always define your custom needs clearly at the RFQ stage. Share schematics, performance requirements, or physical constraints to speed up DFM (design for manufacturability) and avoid design loops.
No matter how well a battery pack is engineered, poor packaging or inadequate protection can lead to premature failure, certification issues, or even safety risks during shipping and use. That’s why professional 21700 pack suppliers offer multiple packaging and protection options—each optimized for the environment, application, and logistics channel you’re targeting.
Here’s how we typically protect and deliver 21700 battery packs:
Enclosure Options Based on Use Case
| Enclosure Type | Description | Typical Application |
|---|---|---|
| PVC Shrink Wrap | Lightweight and space-saving. Suitable for internal installations where housing is already provided. | E-bikes (internal), robots, testing samples |
| Plastic Casing | Custom-molded for shape and insulation. Adds mechanical strength. | Electric tools, light mobility |
| Aluminum Housing | Durable, heat-dissipating, EMI-resistant. Available in custom shapes. | Medical, industrial robots, EVs |
| IP65/IP67 Waterproof Case | Sealed against dust and water ingress. Ideal for outdoor and marine use. | Delivery vehicles, surfboards, agriculture |
Shipping Packaging and Internal Protection
All packs are:
Wrapped with anti-static film
Secured in foam or molded trays
Packed in UN38.3-compliant outer cartons with lithium battery warning labels
Optionally vacuum-sealed for export
We also support custom export packaging, including:
Palletized shipments
Drop-tested cartons
QR-coded labels for warehouse integration
Thermal, Impact, and Vibration Protection
For sensitive environments (e.g., drones, high-vibration tools), we can add:
Silicone thermal pads
Foam spacers between cells
Internal epoxy reinforcement for impact resistance
Tip for Buyers: Inform your supplier of the final installation environment and shipping destination. Battery casing, thermal protection, and labeling may need to comply with local safety regulations (e.g., IEC, DOT, DG shipping).
Clear communication is critical when sourcing a custom 21700 battery pack. Unlike off-the-shelf solutions, OEM battery packs require alignment across multiple technical and operational parameters. The more precise your input, the faster your supplier can deliver accurate designs, quotes, and prototypes.
Here’s how to prepare and communicate your requirements effectively:
Start with a Basic Specification Sheet (or Template)
Include the following minimum information in your RFQ or initial inquiry:
| Parameter | Description |
|---|---|
| Voltage (V) | Nominal voltage of the system (e.g., 48V, 72V) |
| Capacity (Ah) | Desired runtime capacity, e.g., 20Ah |
| Discharge Current | Continuous and peak load requirements (e.g., 30A continuous / 60A peak) |
| Dimensions or Size Limitations | Target max dimensions or shape constraints |
| Connector Type | XT60, Anderson, Molex, or custom plug |
| BMS Protocol | Basic or smart (CANBus, UART, RS485) |
| Environment | Indoor / outdoor, waterproofing, vibration level |
| Certifications Required | UN38.3, MSDS, IEC 62133, RoHS, etc. |
2. Provide Visual References Whenever Possible
Mechanical drawings or housing CAD files (STP/DWG)
Photos of current or legacy batteries for compatibility reference
Wiring diagrams or load profile charts if custom load behavior is expected
Tip: Even a rough sketch or annotated photo can reduce back-and-forth clarification.
3. Clarify Application and Use Case
Let the supplier know:
What device or system this battery is for
Expected operating hours per day / charge cycles
Any regulatory market (EU, US, etc.)
Special conditions like shock, temperature, or altitude exposure
4. Ask for DFM Support (Design for Manufacturability)
Experienced suppliers can help optimize:
Internal layout for better heat management
Cell selection based on your cost–performance balance
Mechanical casing that fits your device housing perfectly
5. Confirm Production & Delivery Expectations
Specify:
The more details you provide upfront, the faster your project can move from concept to delivery—with fewer revisions, lower risks, and better cost control. A professional supplier will gladly work with your team to finalize specs through DFM and pilot runs.
For B2B buyers, especially in high-risk applications like e-mobility, robotics, or medical devices, reliability is non-negotiable. That’s why experienced lithium battery pack suppliers implement structured quality assurance workflows to validate safety, consistency, and performance—long before your packs are shipped.
At Junda Battery, every 21700 pack goes through the following QA stages: 
1. Incoming Cell Inspection & Matching
Check voltage, capacity, resistance, and batch consistency
Only matched cells (same lot, same grade) are used in one pack
Cell barcodes and batch data are digitally tracked for traceability
2. Assembly Line QA
Spot or laser welding is visually inspected for uniformity
BMS is tested for firmware accuracy and hardware integrity
Connectors are torque-tested and visually checked
3. Pre-Shipment Functional Testing
Each completed pack undergoes:
Capacity test (discharge under rated load)
Charge & discharge cycle simulation
Internal resistance check
Short-circuit and overcurrent protection validation
Temperature monitoring under load
All results are logged and traceable via serial number or project code.
4. Aging & Soak Testing (Optional for Volume Orders)
For large-scale or mission-critical deployments, we offer:
48–72 hour charge/discharge cycling under simulated operating conditions
Environmental chamber testing (temperature, vibration, humidity)
Burn-in detection for early component failure
5. Final QC & Labeling
Surface, barcode, and label checks
Certification and documentation review (UN38.3, MSDS, etc.)
Final pass/fail status before packing
Tip for Buyers: Ask for a QA checklist or sample report when comparing suppliers. A solid testing workflow is a sign of long-term quality—not just first-batch polish
If your custom 21700 battery packs are destined for international markets—whether powering e-bikes in Europe or robotics in the U.S.—compliance is mandatory. Certification ensures product safety, legal shipping, and smooth customs clearance. Skipping this step can lead to shipment delays, legal penalties, or customer rejections.
Here are the most common compliance requirements by region and use case:
| Certification | Purpose | Applies To |
|---|---|---|
| UN 38.3 | Mandatory for air & sea transport of lithium batteries | Global logistics, all custom battery packs |
| MSDS / SDS | Chemical safety documentation for shipping and handling | Global logistics, B2B buyers, forwarders |
| IEC 62133 | End-product battery safety compliance | EU, India, Asia (consumer/portable devices) |
| RoHS / REACH | Environmental compliance—restricted substances | EU, UK, eco-conscious brands |
| UL 2271 / UL 2054 | Optional safety standard for light EV and commercial packs | USA / North America (scooters, e-bikes, tools) |
Certifications may vary by project. We support both in-house and third-party testing based on your target market.
Thanks to their higher energy density, longer cycle life, and better heat control, 21700 battery packs are widely used across industries that demand both performance and reliability. From mobility and logistics to industrial automation, here are the most common B2B application areas:
21700 battery packs are widely used in e-bikes and scooters due to their higher energy density and long cycle life. They support 36V, 48V, and 52V systems, making them ideal for urban commuting, long-distance riding, and off-road power delivery.
For drills, cutters, and other portable tools, 21700 packs offer high discharge performance in a small footprint. Fewer cells are needed compared to 18650, reducing weight while maintaining high output.
In smart logistics, 21700 packs provide reliable power for AGVs and AMRs. Their compact size, smart BMS compatibility, and long runtime make them suitable for 24/7 industrial operations with minimal downtime.
Medical carts, portable diagnostics, and mobile imaging units benefit from the safety and stability of 21700 packs. They can be customized to meet IEC 62133, UN38.3, and other compliance needs for international healthcare markets.
We offer free design consultations to recommend the right 18650 battery pack structure for your specific application and housing requirements.
Not all lithium battery suppliers are created equal. While many can assemble a pack, few have the engineering depth, certification experience, and quality discipline required for OEM-grade 21700 battery solutions.
Here’s what to look for when selecting your long-term battery manufacturing partner:
1. Technical Capability Over Price
Can they recommend the right cell chemistry and configuration based on your load profile?
Do they offer smart BMS integration and support protocols like CANBus or UART?
Can they customize pack shape, connectors, and casings based on your device constraints?
Ask for previous engineering case studies or samples—not just price sheets.
2. In-House QA Process (Not Just Assembly)
Do they conduct cell sorting, resistance balancing, and cycle testing?
Can they show you their aging test logs or inspection reports?
Do they provide batch traceability and serial number tracking?
A factory without structured QA is a gamble—especially on large orders.
3. Certification Readiness
Do they already have UN 38.3, MSDS, IEC, or CE documentation?
Are they familiar with your destination market’s compliance rules?
Suppliers who delay certification are often unfamiliar with international trade protocols.
4. Responsive Communication & Engineering Support
Do you get answers within 24 hours, especially during sampling?
Are you communicating with engineers or just sales reps?
Will they proactively raise DFM suggestions?
Strong teams help reduce miscommunication, shorten sampling cycles, and lower your risk.
5. Scalable Production & Reliable Lead Times
Can they deliver stable output from sample to mass production?
Do they have backup plans for cell sourcing or BMS components?
Are they experienced with OEM and ODM workflows?
Final Tip: Ask for a pilot batch. The first 50–100 pcs will tell you everything about their build quality, packaging, and process control.
Custom 21700 battery packs offer high energy density, longer cycle life, and flexible configurations for demanding OEM applications. To source them effectively, B2B buyers should focus on clear specifications, compliance requirements, and choosing a reliable, engineering-driven supplier.
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.
