Overview
The 3S 20A BMS (Battery Management System) is a protective circuit board designed for 3-cell series (3S) Lithium-ion or Lithium-polymer battery packs. It ensures your 11.1V (nominal) / 12.6V (max) battery stays within safe operating limits. Without a BMS, Lithium cells can be easily damaged by draining them too low or charging them too high—this board prevents both, acting as a constant sentry for your power source.
Key Features
Triple Guard Protection: Automated safety shut-off for overcharge, over-discharge, and short-circuit conditions.
20A Current Capacity: Supports up to 20A of continuous discharge, making it ideal for high-brightness LEDs, DC motors, and portable speakers.
High-Precision Voltage Detection: Monitors each of the three cells individually to ensure total pack safety.
Compact Footprint: Small enough to be tucked inside narrow battery cases or 3D-printed enclosures.
Technical Specifications
| Feature | Specification |
| Battery Configuration | 3 Series (3S) |
| Nominal Voltage | 11.1V |
| Max Charge Voltage | 12.6V to 13.0V |
| Continuous Discharge Current | 20A |
| Overcharge Protection | 4.25V \pm 0.05V |
| Over-discharge Protection | 2.5V \pm 0.05V |
| Internal Resistance | <100m\Omega |
| Board Dimensions | ~59mm x 20mm |
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