Overview
The 1S 3A BMS (Protection Circuit Module) is a compact yet powerful safety controller for single-cell lithium projects. What sets this module apart is the factory-soldered wire leads, which significantly reduce assembly time and the risk of damaging the board with excessive heat during DIY soldering. It provides a 3A continuous discharge current, making it the perfect middle-ground for LED projects, small robotics, and portable DIY gadgets.
Key Features
Pre-Soldered Wires: Ready to use out of the box—just connect to your battery and load.
Dual-Stage Protection: Shields your battery from Overcharging (which causes swelling) and Over-discharging (which kills the cell).
3A Output: Provides enough current for most microcontroller projects, sensors, and small motors.
Ultra-Slim Profile: Designed to be taped directly to the side of an 18650 cell or tucked into a Li-Po battery’s heat shrink.
Short Circuit Recovery: Automatically shuts down the output if a short is detected, protecting your electronics.
Technical Specifications
| Feature | Specification |
| Battery Type | 1S (3.7V Nominal / 4.2V Max) |
| Continuous Current | 3.0 Amperes |
| Overcharge Detection | 4.25V \pm 0.05V |
| Over-discharge Detection | 2.5V \pm 0.1V |
| Over-current Detection | 5A \pm 1A |
| Internal Resistance | < 60mΩ |
| Wire Length | ~50mm to 100mm (Approx.) |
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