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
| Feature | Specification |
| Configuration | 1S (Single Cell 3.7V/4.2V) |
| Max Continuous Current | 4.0 Amperes |
| Overcharge Voltage | 4.25V \pm 0.05V |
| Over-discharge Voltage | 2.5V \pm 0.05V |
| Over-current Detection | ~5A to 6A (Instantaneous) |
| Quiescent Current | < 6uA (Ultra-low standby drain) |
| Dimensions | Approx. 35mm x 4mm (Slim Profile) |
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