BMS 20A 3S with Protection Board

🔹 BMS 3S 20A Battery Protection Board – Li-ion 18650, Overcharge & Short Circuit Protection

This 3S 20A Battery Management System (BMS) board is designed for 3-cell series Li-ion battery packs (11.1V/12.6V). It provides essential protection against overcharge, over-discharge, overcurrent, and short circuits, ensuring safe operation for DIY power projects, power banks, and portable electronics.

✅ Specifications:

• Cell Configuration: 3S (3 cells in series)

• Battery Type: Li-ion / 18650 / 26650 / Li-Polymer (3.6V-3.7V cells)

• Nominal Voltage: 11.1V

• Fully Charged Voltage: 12.6V

• Maximum Discharge Current: 20A

• Maximum Charge Current: 10A

• Charging Voltage: 12.6V – 13V

• Overcharge Protection: 4.25V ± 0.05V per cell

• Over-discharge Protection: 2.75V ± 0.05V per cell

• Short Circuit Protection: Yes (self-recovery)

• Overcurrent Protection: Yes

• Quiescent Current: <30µA

• Dimensions: ~56mm x 45mm x 3mm (varies by model)

📦 Applications:
✔️ DIY 3S Li-ion battery packs
✔️ Portable power banks and UPS systems
✔️ E-bike and power tool batteries
✔️ Solar energy storage systems
✔️ Robotics and RC battery packs
✔️ LED lighting and audio equipment
✔️ Replacement or upgrade for existing BMS

⚠️ Important Note:

• Wiring order: Always connect B- (battery negative) first, then B1, B2, B3, followed by P- (load/charger negative). Incorrect wiring may damage the BMS.

• Matching cells: Use cells with similar capacity and voltage for best performance.

• Balance feature: Basic balancing, not active balancing.