4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing — 18650 Battery Pack

4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing — 18650 Battery Pack

This 4S 30A BMS protection board provides comprehensive protection and passive cell balancing for 4-cell series Li-ion battery packs at 14.8V nominal (16.8V fully charged). With a 30A continuous discharge rating and built-in balancing, it is designed for power tools, e-bike auxiliary packs, robotics, and high-current DIY battery applications.

Key Specifications

Parameter	Value
Configuration	4S (4 cells in series)
Nominal Voltage	14.8V
Full Charge Voltage	16.8V (4.2V per cell)
Continuous Discharge Current	30A
Overcharge Protection	4.25V ±0.05V per cell
Over-Discharge Protection	2.5V ±0.1V per cell
Cell Balancing	Yes (passive balancing)
Operating Temperature	-30°C to +80°C
Compatible Cells	18650, 26650, Li-ion pouch

Why Choose This 4S BMS?

• ✅ 30A continuous rating — handles power tool motors and high-drain loads
• ✅ Cell balancing included — equalizes cell voltages for longer pack lifespan
• ✅ Full protection suite — overcharge, overdischarge, overcurrent, short circuit
• ✅ 14.8V / 16.8V system — compatible with 14.4V–18V power tool voltage range
• ✅ -30°C to +80°C — reliable in cold and hot environments

Typical Applications

• DIY 4S 18650 power tool battery pack (14.4V–16.8V)
• E-bike auxiliary battery protection
• Robotics and heavy-duty motor drive battery
• RC vehicle high-voltage Li-ion pack
• Portable power station 14.8V module

Package Contents

• 1 × 4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing

Enjoy free standard shipping on all orders over $199 USD. Orders are processed within 1–2 business days.

Not satisfied? Return any item within 90 days of purchase for a full refund or exchange. Items must be in original condition.

We are committed to quality, reliability, and customer satisfaction. Every product is carefully selected and tested to meet the highest standards.