Leading the Industry with 1000+ BMS Models
The evolution of energy storage and electric mobility demands absolute precision and safety. At XJBMS, we have engineered an unparalleled lineup of over 1000 models of 4S BMS. Whether you require a compact 5A board for consumer electronics or a heavy-duty 300A system for industrial applications, our extensive portfolio guarantees a perfect match for your specific voltage and current requirements.
Our 4S series is meticulously categorized into Hardware BMS and Smart BMS. Hardware BMS provides robust, latency-free physical protection utilizing high-grade MOSFETs and thick heat sinks, ideal for high-current scenarios like delivery tricycles. Conversely, our Smart BMS integrates cutting-edge microprocessors, offering Bluetooth, CAN bus, RS485 communication, and GPS tracking. This allows users to monitor real-time cell voltage, temperature, and State of Charge (SOC), making it the ultimate choice for advanced grid-off energy storage and smart electric vehicles.
9-Layer Comprehensive Protection Protocol
Safety is the cornerstone of every XJBMS product. Our 4S BMS series is equipped with a state-of-the-art 9-layer protection protocol, ensuring the longevity of your battery packs and the absolute safety of the end-user.
Over-Charge Protection
Instantly severs the charging circuit when the voltage exceeds safe thresholds, preventing thermal runaway and battery swelling.
Over-Discharge Protection
Safeguards cell chemistry by cutting off power delivery before the battery drains below its critical low-voltage limit, ensuring cell longevity.
Over-Current Protection
Monitors discharge rates in real-time. If the current spikes beyond the rated capacity (up to 300A), the BMS instantly isolates the load.
Short-Circuit Protection
Microsecond-level response to short circuits, preventing catastrophic hardware damage and fire hazards in extreme conditions.
NTC Temp Sensor
Integrated NTC thermistors actively monitor cell temperatures, providing robust temperature protection against extreme heat and cold.
Balance Function
Actively or passively balances the voltage across all 4 series cells, ensuring maximum capacity utilization and pack longevity.
Electrostatic Protection
Advanced ESD (Electrostatic Discharge) protection shields the delicate PCBA components from static electricity during installation and operation.
Dust & Moisture Protection
Conformal coating and superior sealing provide IP-rated dust protection and moisture protection, ensuring reliability in harsh outdoor environments.
Empowering Diverse Applications
The versatility of the XJBMS 4S series is unmatched. Because our models span from 5A all the way up to 300A, they can be deployed in virtually any scenario requiring a 12V-14.8V battery pack. From lightweight mobility to heavy industrial storage, XJBMS is the invisible shield powering the modern world.
Electric Power Tools
High-drain devices like electric drills, grinders, and pruners demand sudden bursts of energy. Our 4S 10A-40A BMS models (like the XJ-D026 and XJ-D063) handle high discharge peaks flawlessly, protecting 18650 and 21700 cells from premature degradation.
Electric Scooters & Vehicles
For electric two-wheelers, delivery tricycles, and golf carts, sustained power and safety are critical. Our best-selling 4S 100A BMS (XJ-D301) with built-in heat sinks guarantees stable cruising and climbing without overheating.
Grid-Off Energy Storage
Solar home systems and RV power banks rely heavily on prismatic LiFePO4 batteries. Our high-current Smart BMS (up to 300A) ensures perfect cell balancing and seamless integration with solar inverters for continuous off-grid energy.
4S 5A-300A BMS: Ultimate Compatibility Guide
If you’re searching for a 4S battery protection board (BMS) — ranging from 5A to 300A current ratings — you’re likely asking these key questions: What are the applications of a 4s Bms? Which batteries are compatible? Can it work with 18650, 21700, or prismatic LiFePO4 cells? Can a 4S 100A BMS be used for delivery tricycles?
What Is a 4S BMS? Why Choose 4S Configuration?
A 4S BMS refers to a 4-cell series battery protection board. It protects the pack from overcharging, over-discharging, overcurrent, short circuits, and overheating. The 4S configuration is incredibly versatile:
- 4S NMC/LCO cells (18650, 21700): Nominal voltage = 14.8V. Perfect for consumer electronics and power tools.
- 4S LiFePO4 cells: Nominal voltage = 12.8V. Ideal for energy storage and EVs requiring extreme safety.
- 4S Sodium-ion cells: Nominal voltage = 12V. Excellent low-temperature performance for tricycles and motorcycles.
Battery Compatibility: 18650, 21700, and Prismatic LiFePO4
18650 Battery Cells: Mostly NMC/LCO chemistry. Best paired with our 4S 5A-40A BMS (e.g., XJ-D133, XJ-3434-V1, XJ-D026).
21700 Battery Cells: Higher capacity and discharge current. Work flawlessly with our 4S 10A-100A BMS (e.g., XJ-D063, XJ-D301).
Prismatic LiFePO4 Cells: Capable of massive discharge currents. Top choice for high-power scenarios when paired with our 4S 150A-300A BMS (like the XJ-D038V5).
Key Compatibility Tip: All our 4S BMS models support NMC, LCO, and LiFePO4 batteries natively. Just confirm your battery cell’s maximum discharge current and your device’s power requirements!
Hot-Selling 4S PCBA BMS Models
A snapshot of our most popular common port, compact design BMS boards.
| Factory BMS Model | Current Rating | Port Type | Dimensions (mm) | Applications |
|---|---|---|---|---|
| XJ-3434-V1 | 10A | Common Port | 55*26*5 | Compact size, small consumer electronics |
| XJ-D096 | 5A-40A | Common Port | 38*35*4 | Small square design, mini battery packs |
| XJ-D026 | 10A | Common Port | 49*49*3 | Square thin design, ideal for small electric tools |
| XJ-D063 | 40A | Common Port | 110*62*4 | Medium size, medium-power electric tools |
| XJ-D301 | 50A-100A | Common Port | 150*65*15 | BEST-SELLING ideal for delivery tricycles & EVs |
| XJ-D038V3 | 150A-300A | Common Port | Custom | Industrial & High-Power Applications |
About XJ-BMS
Dongguan XuanJing Electronics Co., Ltd. (Brand: XJ BMS) is a high-tech firm founded in 2015, focusing on developing, customizing, producing, and marketing PCBA, Battery Management Systems (BMS), PCM, and Active Balancers for Lifepo4, li-ion, and sodium-ion batteries. With a top-notch dust-free workshop, cutting-edge tools, and ISO9001, CE, RoHs, EMC and Reach certifications, we ensure every product is of excellent quality with a 2-year warranty.
Our Mission
To make the world safer and smarter through advanced energy management solutions.
Our Vision
To be a world-class green energy solution provider, driving the future of sustainable power.
Our Values
Keep being responsible.
Keep our words.
Keep developing.
Honor, Certification & Exhibition
Global presence and internationally recognized quality standards.
Partner With XJBMS Today
We offer competitive factory prices, high-quality products, and professional services to help you reduce costs and improve efficiency. Contact us for 4S BMS samples, full customization support, and free tailored BMS solutions. Our team guarantees a 24-hour response time!
