3.7V 3A 18650 Li-ion Battery Protection Board – Single Cell BMS Without Balancing

This 3.7V 3A Protection Board (BMS) is designed for single-cell 18650 lithium-ion batteries and provides essential safety features without the complexity of cell balancing. Ideal for low- to medium-power battery-powered projects, this board ensures safe charging and discharging, protecting against overcharge, over-discharge, and overcurrent conditions.

Built with high-accuracy voltage detection and a multi-stage over-current protection system, it uses reliable MOSFET switching to manage battery flow. Compact and lightweight, it's perfect for integrating into small electronic devices, portable chargers, and DIY battery packs.

Features

• High-Accuracy Voltage Detection – Prevents battery damage from incorrect charging/discharging.

• Three-Stage Overcurrent Protection – Includes overcurrent level 1, level 2, and short-circuit protection.

• MOSFET-Based Switching – Efficient control of charge/discharge paths.

• Charger High-Voltage Tolerance – Safe to use with higher-voltage charging terminals.

• Ultra-Compact Size – Slim form factor suitable for tight spaces.

Specifications

• Battery Type Supported: Single-cell Li-ion (e.g., 18650)

• Overcharge Voltage: 4.25V ± 0.05V

• Overcharge Release Voltage: 4.23V ± 0.05V

• Overdischarge Voltage: 2.54V ± 0.1V

• Max Continuous Charge Current: 2A

• Max Continuous Discharge Current: 2A

• Overcurrent Protection Limit: 3A

• Protection Method: MOS transistor switching

• Size: 40mm × 4mm × 3mm

Applications

• DIY 18650 Battery Packs

• Portable Power Banks

• Battery Protection for Embedded Systems

• Rechargeable Flashlights

• Low-Power IoT Devices

• Electronic Gadgets with Single Li-ion Cell