1S 3A 3.7V Li-ion Battery Protection Board

The 1S 3A 3.7V Li-ion Battery Protection Board is a compact yet powerful BMS (Battery Management System) designed to provide complete protection for single-cell lithium-ion batteries (18650). It maintains stable voltage, prevents overcharge/discharge, and safeguards against overcurrent and short-circuit conditions.

This protection board ensures safe charging and discharging cycles, extending battery life and preventing damage in DIY battery packs, portable devices, RC toys, and IoT systems. Its high-efficiency MOSFET circuit makes it suitable for Arduino-powered applications, solar devices, and electronic prototypes.

⚙️ Key Features

• 🔋 Overcharge & Over-discharge Protection – Maintains battery health and safety.

• ⚡ Short Circuit & Overcurrent Protection – Prevents damage to battery and circuit.

• 🔧 Compact & Lightweight PCB Design – Easy to integrate into small enclosures.

• 🧠 Auto Recovery Function – Automatically resets after fault removal.

• 🔌 Compatible with 3.7V 18650 Lithium Cells – Ideal for single-cell setups.

• 🔄 Stable 3A Output Current – Ensures consistent power delivery.

• 🧰 Perfect for DIY Power Projects – Power banks, IoT sensors, and Arduino modules.

📐 Technical Specifications

🧩 Applications

• 🔋 Power Banks and Battery Packs

• 🤖 Robotics & IoT Devices

• ⚙️ DIY Energy Storage Systems

• 🧠 Arduino and Microcontroller Projects

• 💡 Solar-Powered Electronics

• 🔌 Portable Lights & Fans

• 🧰 Rechargeable Tools and Prototypes

⚠️ Precautions

• Ensure proper polarity connection before use.

• Do not exceed the maximum load current (3A).

• Use only with 3.7V Li-ion or Li-polymer batteries.

• Avoid short-circuiting the terminals.

• Always use a regulated charger or Power Supply.

• Mount with care to prevent thermal damage during soldering.

🧰 Recommended Accessories

• 🔋 18650 Battery Holders – For secure battery mounting.

• ⚙️ Power Supply Modules – For safe charging circuits.

• 💡 Boost Converters – To step up voltage for devices.

• 🧠 Arduino Boards – For automation and monitoring.

▶️ YouTube Tutorial Video

🎥 Watch: How to Use 1S 3A 3.7V Li-ion BMS with 18650 Battery

📝 Product Summary

The 1S 3A 3.7V Li-ion BMS PCB Protection Board is a reliable and affordable solution for protecting single-cell 18650 lithium batteries in DIY and professional applications. Its robust protection circuitry prevents damage, enhances safety, and extends battery life — making it ideal for power banks, Arduino projects, and portable electronics.