3S 40A 18650 Battery Charger Protection Board (BMS)

This 3S 40A BMS is designed to manage and protect 3-cell lithium-ion battery packs. It ensures safe charging, discharging, and balancing of each cell, preventing overcharge, over-discharge, overcurrent, and short-circuit issues. Ideal for battery packs used in e-bikes, power tools, solar storage, and DIY energy systems.

Features

3-Cell (3S) Protection Supports 3-cell Li-ion battery packs. High Current Handling Supports continuous discharge current up to 40A, suitable for high-power applications. Overcharge Protection Prevents battery voltage from exceeding safe limits. Over-discharge Protection Cuts off power when the cell voltage drops too low, extending battery life. Short Circuit & Overcurrent Protection Provides automatic recovery after fault removal. Cell Balancing Function Helps maintain equal voltage across all cells during charging.

Specification

Battery Type: Li-ion Number of Cells: 3S (3 cells in series) Max Continuous Discharge Current: 40A Charging Voltage: 12.6V Overcharge Detection Voltage: ~4.25V ± 0.05V Over-discharge Detection Voltage: ~2.7V ± 0.1V Balance Function: Yes Short Circuit Protection: Yes, with auto recovery