1S 4A BMS Li-ion Battery Protection Module 3.7V – FDC-3540 High Current PCM for 18650/Li-Po

Overview

The 1S 4A BMS (FDC-3540) is a high-quality protection board designed for single-cell (3.7V nominal, 4.2V max) Lithium-ion or Lithium-polymer batteries. Unlike basic protection circuits, this module handles up to 4 Amperes of continuous current, making it ideal for micro-robotics and drones that pull significant power during startup. It ensures your cell never drops below a dangerous voltage or swells up due to overcharging.

Key Features

• Higher Current Limit: 4A continuous discharge capacity—perfect for driving small DC motors or high-brightness COB LEDs.

• Precision Monitoring: Uses high-accuracy voltage detection circuits to safeguard your expensive 18650 or Li-Po cells.

• Compact Footprint: Extremely small rectangular design, easy to solder directly onto battery terminals or tuck inside shrink wrap.

• Low Resistance: Uses high-efficiency MOSFETs to ensure minimal voltage drop across the protection board.

Technical Specifications