3S 20A Lithium-Ion Battery Protection Board (BMS) – For 18650 Cells

🔋 3S 20A Li-ion Lithium Battery Charger Protection Board – BMS PCB for 18650 / 26650 / Li-Po Cells

🧾 Description:

This 3S 20A BMS (Battery Management System) Protection Board is designed for three-cell lithium battery packs (3S) using 18650, 26650, or Li-Polymer cells. It provides full protection from overcharging, over-discharging, overcurrent, and short circuits, ensuring battery safety and longevity. Ideal for use in DIY battery packs, robotics, drones, e-bikes, or any project requiring reliable power management.

✅ Key Features:

🔋 Supports 3S Lithium Battery Packs (Nominal Voltage: 3.6V / 3.7V)

⚡ Charging Voltage: 12.6V

🔌 Max Continuous Output Current: 20A

💥 Max Output/Charging Power: 252W

📐 Compact Size: 64mm × 20mm × 3.4mm

🔧 Durable Metal Construction

⚠️ Important Notes:

Follow Wiring Exactly: Connect as per 0V / 4.2V / 8.4V / 12.6V diagram to avoid damaging the chip.

Charge to Activate: After connecting batteries, the board must first be charged to activate output.

Do Not Mix Cells: Use batteries with matched capacity and internal resistance for best performance.

Recommended for users with basic knowledge of BMS and lithium battery packs.

⚙️ Specifications:

Battery Types Supported: 18650 / 26650 / Li-ion / Li-Po

Number of Cells: 3 (3S)

Max Output Current: 20A

Max Charging Voltage: 12.6V

Max Power Output: 252W

Material: Metal PCB

📦 Package Includes:

1 × 3S 20A Li-ion BMS Protection Board