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
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🔋 Overcharge & Over-discharge Protection – Maintains battery health and safety.
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⚡ Short Circuit & Overcurrent Protection – Prevents damage to battery and circuit.
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🔧 Compact & Lightweight PCB Design – Easy to integrate into small enclosures.
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🧠 Auto Recovery Function – Automatically resets after fault removal.
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🔌 Compatible with 3.7V 18650 Lithium Cells – Ideal for single-cell setups.
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🔄 Stable 3A Output Current – Ensures consistent power delivery.
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🧰 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
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🔋 Power Banks and Battery Packs
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🤖 Robotics & IoT Devices
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⚙️ DIY Energy Storage Systems
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🧠 Arduino and Microcontroller Projects
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💡 Solar-Powered Electronics
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🔌 Portable Lights & Fans
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🧰 Rechargeable Tools and Prototypes
⚠️ Precautions
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Ensure proper polarity connection before use.
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Do not exceed the maximum load current (3A).
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Use only with 3.7V Li-ion or Li-polymer batteries.
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Avoid short-circuiting the terminals.
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Always use a regulated charger or Power Supply.
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Mount with care to prevent thermal damage during soldering.
🧰 Recommended Accessories
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🔋 18650 Battery Holders – For secure battery mounting.
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⚙️ Power Supply Modules – For safe charging circuits.
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💡 Boost Converters – To step up voltage for devices.
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🧠 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.
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