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OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function

OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function

OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function
OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function
Categories BMS PCB PCM
Brand Name: BAKTH / Neutral / OEM
Model Number: BAKTH-004S006A-0084-01
Certification: IEC62133
Place of Origin: Dongguan China
MOQ: 2 Piece
Price: USD 8.75~13.5 /PC
Payment Terms: T/T
Supply Ability: 10000PCS/Month
Delivery Time: 3-4 weeks
Packaging Details: Industrial Paper Carton
Type: 4S lithium battery protection board
Compatible interface: SMBUS
Battery Type: Li-ION
Over charge detection voltage(Cell): 4.250V±0.025V Adjustable
Over Discharge Detection Voltage(Cell): 2.400V±0.050V Adjustable
Over Current Discharge: 13.5A±0.2A Adjustable
Over Current Charge: 5.5A±0.2A Adjustable
Discharging Temperature: -25℃~65℃ Adjustable
Charge Temperature: -5℃~55℃ Adjustable
Dimension: 130*25*2.2 mm
Max.Discharge Current: 10A
Sample: Available
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Company Info.
Shenzhen BAK Technology Co., Ltd.
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OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function



The 4S Lithium Battery Protection Board is a specialized safety and performance component exclusively engineered for 4-cell series (4S) lithium battery packs, covering Li-ion, Li-polymer, and LiFePO4 chemistries. As a critical “safety guardian” for 4S battery systems, it prevents irreversible damage, mitigates safety hazards (e.g., thermal runaway), and extends battery lifespan—making it indispensable for high-voltage consumer electronics, industrial equipment, and mid-power portable energy solutions.​
Tailored Protection for 4S Battery Packs​
Optimized for 4S configurations (nominal voltage: 14.8V for Li-ion, 12.8V for LiFePO4), this board delivers multi-dimensional safeguards calibrated to 4-cell characteristics:​
  • Overcharge Protection: Triggers when any single cell exceeds 4.25V (Li-ion) or 3.65V (LiFePO4), instantly cutting off charging current to avoid cell swelling, electrolyte leakage, or thermal risks—critical for 4S packs where voltage accumulation amplifies overcharge hazards.​
  • Undervoltage Protection: Shuts down discharge if any cell drops below 2.5V (Li-ion) or 2.0V (LiFePO4), preventing permanent capacity loss that plagues 4S packs when “weak cells” drag down the entire system.​
  • Overcurrent & Short-Circuit Protection: Blocks high currents (up to 35A, model-dependent) caused by short circuits or overloads (e.g., high-power tool startups), shielding both the 4S battery pack and connected devices from burnout.​
  • 4-Cell Balancing: Automatically equalizes voltage across all 4 cells during charging, eliminating uneven charge distribution (a common issue in multi-cell packs) and ensuring each cell operates at peak efficiency—avoiding “capacity bottlenecks” from undercharged cells.​
High Precision & Low Idle Power Drain​
Equipped with high-sensitivity voltage detection chips, the board monitors each of the 4 cells with ±2mV precision, ensuring timely and accurate protection responses even for subtle voltage fluctuations. Its ultra-low static current (<10μA) minimizes idle power consumption, preventing unnecessary capacity loss when the 4S pack is stored or not in use—critical for backup devices like emergency lights or portable storage units. Additionally, it features a auto-recovery function: once fault conditions (e.g., overcurrent) are resolved, it resumes normal operation without manual reset, enhancing user convenience.​
Broad Compatibility & Rugged Design​
This protection board supports 4S battery packs with capacities ranging from 1500mAh to 30000mAh, adapting to diverse power needs. It is fully compatible with standard 4S chargers and discharge devices, and works seamlessly with Li-ion, Li-polymer, and LiFePO4 chemistries—eliminating the need for multiple protection boards for different battery types. Constructed with a flame-retardant PCB board and industrial-grade components, it withstands extreme temperatures (-20°C to 85°C) and mechanical vibration, making it reliable for harsh environments like construction sites (electric tools) or outdoor adventures (camping power stations).​
Versatile High-Voltage Applications​
Ideal for 4S battery-powered devices requiring stable high voltage:​
  • Consumer electronics: 4S drone batteries (for longer flight time), high-capacity power banks (fast charging support), and professional LED work lights;​
  • Industrial equipment: 4S cordless power tools (e.g., heavy-duty drills, angle grinders), IoT sensor arrays (high-power transmission), and small medical devices (e.g., portable oxygen concentrators);​
  • Recreational & mobility gear: 4S electric scooters, RC cars/boats (high-torque performance), and camping portable fridges.
About Us

Shenzhen BAKTH Technology Co., Ltd. was established in 2002. For 21 years, we've specialized in battery pack assembly and PCM/BMS design and production. Our 5,000-square-meter factory features automated production lines and SMT assembly capabilities.

Certifications
FAQ
What kind of certificate your battery pack owned?

ISO9001, ISO14001, UL, BIS, KC, USTC, CE, CB - our battery packs have reliable quality assurance.

Do you have MOQ?

No limitation - we offer competitive pricing based on order quantity. Sample orders are welcome to test our quality before bulk orders.

What's the warranty? How can we guarantee quality?

Standard warranty is 12 months (negotiable for special products). Our complete production process ensures quality before shipment.

What's the lead time?

Standard products: 3-4 weeks for samples (depending on cell availability), 5-8 weeks for bulk orders (varies by model and quantity).

Can we have our own Logo on the battery pack? Can you accept customized battery?

Yes - our professional R&D team can provide customized solutions according to your requirements.

Product Tags:

14.8V Li-ion BMS board

  

BMS protection board with balance

  

OEM 4S BMS PCB

  
Quality OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function for sale

OEM Support 4S 14.8V Li-ion BMS Protection Board with Balance Function

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