4S 30A 14.4V BMS Balancer PCB – 18650 Li-Ion Battery Board
4S 30A 14.4V BMS Balancer PCB – 18650 Li-Ion Battery Board
4S 30A 14.4V BMS Balancer PCB – 18650 Li-Ion Lithium Battery Protection Board
Keep your lithium battery packs running safely and efficiently with this LOTHYE 4S 30A 14.4V Battery Management System (BMS) PCB module. Designed for 18650, LiPo, and Li-Ion cells in a 4-series configuration, this compact circuit board provides overcharge, over-discharge, and short-circuit protection — while its built-in cell balancing function keeps every cell in your pack at an equal voltage for maximum performance and longevity.
Made in Mainland China.
Key Features
- 4S Configuration: Supports four lithium cells in series (3.6V × 4 = 14.4V total charge voltage)
- 30A Continuous Discharge: Handles demanding loads with ease
- Built-In Cell Balancing: Actively equalizes cell voltages during charging to extend overall pack life
- Multi-Layer Protection: Guards against overcharge, over-discharge, overcurrent, and short circuits
- Compact PCB Module: Easy to integrate into DIY battery packs and electronic projects
- Brand New & High Quality: 100% new components for reliable, long-lasting performance
Specifications
- Brand: LOTHYE
- Configuration: 4S (4 cells in series)
- Rated Cell Voltage: 3.6V per cell
- Charging Voltage: 14.4V (3.6V × 4)
- Continuous Discharge Current: 30A
- Compatible Cell Types: 18650, LiPo, Li-Ion
- Type: Module / PCB Board
- Condition: Brand New
- Origin: Made in Mainland China
Compatible Applications
- Cordless vacuum cleaners
- Massager battery packs
- LED backup power supplies
- 12.8V Li-Ion electronics
- Solar-powered LED systems
- DIY lithium battery pack projects
⚠️ Important Compatibility Notice
This protection board is not compatible with lithium iron phosphate (LiFePO4) batteries, HID/xenon lamps, hand drill battery packs, electric fishing machine packs, electric bicycle packs, children's ride-on car batteries, 550 (4A) motors, or 1W fisheye LED lights. Please verify your application before purchase.
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Frequently Asked Questions
Q: What battery cell types is this 4S BMS PCB compatible with?
A: This BMS board is designed for standard lithium-ion (Li-Ion) and LiPo cells, including the popular 18650 format, arranged in a 4-series (4S) configuration with a nominal 3.6V per cell and a full charge voltage of 14.4V. It is not compatible with LiFePO4 (lithium iron phosphate) cells, which have a different voltage profile.
Q: What does the balancing function do and why does it matter?
A: The built-in cell balancer monitors and equalizes the voltage across all four cells in your pack during charging. Without balancing, individual cells can drift apart in charge level over time, reducing capacity and potentially causing premature cell failure. The balancing circuit keeps every cell topped to the same voltage, maximising your battery pack's lifespan and overall capacity.
Q: Can I use this BMS for an electric bicycle or power tool battery pack?
A: No — this board is rated for a 30A continuous discharge current, which is insufficient for high-draw applications such as electric bicycles, hand drills, or similarly demanding power tools. It is best suited for lighter loads such as vacuum cleaners, LED backup systems, massager packs, and solar LED setups. Always match the BMS rating to your application's current requirements.