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 Parameter Specification Type 1S Li-ion BMS (Single Cell) Input Voltage 3.7V (Nominal) Charging Voltage 4.25V ± 0.05V Discharge Cutoff Voltage 2.5V ± 0.05V Maximum Continuous Current 3A Overcurrent Protection 5–6A Short Circuit Delay 500 µs Dimensions 35 mm × 20 mm (approx.) Operating Temperature -20°C to 60°C Supported Batteries 3.7V 18650 Lithium-ion or Li-Polymer �� 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.
