| Configuration | Capacity (Ah) | Energy (Wh) | Typical Size (mm) | Weight |
|---|---|---|---|---|
| 7S1P | 4.5–5Ah | ~113–126Wh | ~22×70×150 | ~280g |
| 7S2P | 9–10Ah | ~226–252Wh | ~45×70×150 | ~560g |
| 7S3P | 13.5–15Ah | ~339–378Wh | ~65×70×160 | ~840g |
| 7S4P | 18–20Ah | ~452–504Wh | ~85×70×160 | ~1120g |
Custom 7S 25.2V 21700 battery pack with higher energy 21700 cells, BMS with cell balancing, overcharge protection, and IP68 waterproof.
Junda’s 7S 25.2V lithium battery packs are built with high-performance 21700 cells, offering excellent energy density, competitive cost, and extended cycle life. Compared to traditional 25.2V 18650 packs, these advanced solutions are becoming the preferred choice in the market.
Our engineering team develops high-performance 25.2V 21700 battery packs using premium 21700 cells and customized BMS solutions. The advanced BMS includes overcharge protection, over-discharge protection, cell balancing, and multiple safety mechanisms to ensure maximum reliability and long service life.
The 6S 22.2V 21700 lithium battery pack offers high voltage output and superior energy capacity, making it suitable for heavy-duty power tools, professional drones, and industrial-grade equipment. Reviewing its specifications, capacity options, and application scenarios will help you select the right configuration for your needs. Check the details below to find your best match.
| Parameter | Specification |
|---|---|
| Battery Type | 7S 25.2V 21700 Lithium-ion Battery Pack |
| Nominal Voltage | 25.2V |
| Nominal Capacity | 12–20Ah (depending on configuration) |
| Energy | ~302–504Wh |
| Charge Voltage | 29.4V |
| Cut-off Voltage | ~21.0V |
| Continuous Discharge Current | 15A–60A |
| Peak Discharge Current | 30A–80A |
| Operating Temperature | Charge: 0–45℃ / Discharge: -20–60℃ |
| Cycle Life | >500 cycles @ 80% DOD |
| Configuration | Capacity (Ah) | Energy (Wh) | Typical Size (mm) | Weight |
|---|---|---|---|---|
| 7S1P | 4.5–5Ah | ~113–126Wh | ~22×70×150 | ~280g |
| 7S2P | 9–10Ah | ~226–252Wh | ~45×70×150 | ~560g |
| 7S3P | 13.5–15Ah | ~339–378Wh | ~65×70×160 | ~840g |
| 7S4P | 18–20Ah | ~452–504Wh | ~85×70×160 | ~1120g |
| Capacity Range | Common Applications |
|---|---|
| 4.5–5Ah | Portable UAVs, small robotics, field monitoring devices |
| 9–10Ah | Inspection equipment, industrial instruments, mid-size drones |
| 13.5–15Ah | AGVs, professional drones, portable medical and testing systems |
| 18–20Ah | High-drain robotics, heavy-duty UAVs, industrial-grade power systems |
Suitable for diving systems and boats
Ideal for AGVs and industrial robots
Compatible with portable ventilators and patient monitors
For underwater photography equipment
Junda is a professional lithium battery manufacturer, supplying certified battery solutions worldwide. Product standards are continuously improved to help you maintain reliable supply and keep your customers satisfied.
7S8P, built with 56 pcs 21700 5000mAh cells
IP68 waterproof protection with metal housing
BMS includes cell balancing, over-discharge, and over-charge protections
Application: diving equipment or marine vessels
7S10P, assembled with EVE 21700 50E cells
NCM chemistry, 1000 cycles at 80% DoD
RS-485 communication protocol supported
Durable metal housing for industrial use
Application: AGV or industrial robots
7S3P, built with 21700 4Ah cells
Integrated fuel gauge for battery status monitoring
Custom BMS with BQ chip solution
PVC wrap for battery protection
Application: medical equipment
7S11P, built with Full Tab BAK INR2170-45D cells
IP68 waterproof design with aluminum alloy housing
Integrated BMS, 150A continuous discharge, 200A peak discharge
Application: underwater scooters
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.
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.