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
Weight
50 g
Dimensions
15 × 10 × 5 cm
Reviews
There are no reviews yet.
Be the first to review “3S 20A BMS Li-ion Battery Protection Board – 11.1V 12.6V 18650 Charger PCB”Cancel Reply
Reviews
There are no reviews yet.