4S 20A 18650 Lithium Battery Protection Board

Description

The 4S 20A 18650 Lithium Battery Protection Board is a high-grade, precision-tested electronic component designed for reliable performance in prototyping, education, industrial control, and custom hardware engineering.

🔹 Key Features

• •✔ Designed for 4S (4-cell) 18650 lithium-ion battery packs
• •✔ Supports continuous current up to 15A
• •✔ Built-in protection for over-charge, over-discharge, over-current & short circuit
• •✔ Compact square PCB design – easy to install
• •✔ Low power consumption with ultra-low quiescent current

🔹 Technical Specifications

🔹 Pin Configuration & Wiring

🔹 Applications

This component is engineered and suitable for:

• •� Battery Connection Terminals on Board Usually marked as: B- → Battery Pack Negative (Cell 1 –) B1 → Connection between Cell 1 & Cell 2 B2 → Connection between Cell 2 & Cell 3 B3 → Connection between Cell 3 & Cell 4 B+ → Battery Pack Positive (Cell 4 +)
• •� Output / Charge Terminals P- → Load / Charger Negative P+ → Load / Charger Positive (same as B+) 🔧 Step-by-Step Wiring Connect 4 cells in series: Cell order:Cell1 → Cell2 → Cell3 → Cell4 Then wire as: Cell1 negative → B- Cell1 positive / Cell2 negative → B1 Cell2 positive / Cell3 negative → B2 Cell3 positive / Cell4 negative → B3 Cell4 positive → B+ For charging & discharging: Charger / Load positive → P+ (or B+) Charger / Load negative → P-
• •⚠️ Safety Tips Always connect balance wires before main power wires Use proper insulated wires and nickel strips Do not short any terminals Use a 16.8V Li-ion charger for 4S packs Ensure BMS current rating matches your load  

🔹 Package Includes

• ✓1 × 4S 20A 18650 Lithium Battery Protection Board