HX-3S-F100A 3S 100A Li-ion BMS – 12V 18650 Battery Protection Board with Balance for High Power Tools

Overview 

The HX-3S-F100A is an industrial-strength 3S Battery Management System (BMS) designed for 3.7V Lithium-ion or Lithium Polymer cells. Unlike standard modules, this board features a reinforced copper trace design and a large aluminum heat sink to handle high-current bursts up to 100A. Whether you are reviving a dead 12V cordless drill battery or building a portable jump starter, this BMS ensures your cells stay balanced and protected from the dangers of over-discharge and short circuits.

Key Features 

• 100A Peak Current: Engineered to handle massive startup currents required by motors and power tools.

• Integrated Balancing: Features an “Equalizing” circuit that maintains voltage harmony between all three cells, maximizing battery life.

• Superior Heat Dissipation: Comes with a pre-installed aluminum heat sink to prevent the MOSFETs from overheating during heavy use.

• Comprehensive Safety: Built-in protection against over-charge, over-discharge, over-current, and short-circuiting.

• Durable Build: High-quality components and thick PCB traces for low resistance and high efficiency.

Technical Specifications 

Feature	Specification
Model	HX-3S-F100A
Battery Type	3.7V Li-ion / Li-Polymer
Configuration	3S (3 Cells in Series)
Nominal Voltage	11.1V
Full Charge Voltage	12.6V
Continuous Discharge Current	60A – 80A (with cooling)
Instantaneous Peak Current	100A
Overcharge Protection	4.25V ± 0.05V
Over-discharge Protection	2.5V ± 0.1V
Charging Voltage	12.6V – 13.0V