Lithium Battery Charger Protection Module (BMS) 4S (16.8V – 40A)

Product Overview

The BMS 4S 40A Lithium Battery Charger Protection Module is a Battery Management System (BMS) designed to provide essential protection for 4-cell lithium-ion (Li-ion) or LiFePO4 battery packs. It ensures overcharge, over-discharge, overcurrent, and short-circuit protection, helping to extend battery life and maintain safe operation. With a 40A continuous discharge current, this module is ideal for high-power applications such as e-bikes, solar storage systems, and power tools.

Key Features:

• Supports 4S Battery Packs – Compatible with Li-ion (3.7V/cell) and LiFePO4 (3.2V/cell).
• High 40A Continuous Discharge Current – Suitable for demanding applications.
• Overcharge & Over-discharge Protection – Prevents cell damage and extends battery lifespan.
• Overcurrent & Short Circuit Protection – Ensures battery and device safety.
• Cell Balancing Function – Distributes charge evenly for optimal performance.
• Compact & Lightweight Design – Easy integration into various systems.

Technical Specifications:

• Battery Configuration: 4S (4 cells in series)
• Supported Battery Types: Lithium-ion (3.7V per cell), LiFePO4 (3.2V per cell)
• System Voltage: 16.8V (Li-ion) / 14.6V (LiFePO4)
• Continuous Discharge Current: 40A
• Overcharge Voltage Protection: ~4.2V per cell (Li-ion), ~3.65V per cell (LiFePO4)
• Over-discharge Voltage Protection: ~2.5V per cell (Li-ion), ~2.0V per cell (LiFePO4)
• Overcurrent Protection: Yes, activated upon exceeding 40A
• Short Circuit Protection: Yes
• Balancing Function: Yes, passive balancing
• Operating Temperature: -20°C to 60°C
• Module Dimensions: Compact for easy installation

Applications:

• E-bikes & Electric Vehicles – Ensures stable and safe power management.
• Solar Energy Storage – Optimized for renewable energy systems.
• Portable Power Banks – Ideal for high-power battery packs.
• Power Tools & DIY Battery Packs – Provides protection for custom battery projects.

Why Choose the BMS 4S 40A Module?

This BMS module offers reliable protection, high power handling, and efficient cell balancing, making it a top choice for 4S lithium battery applications.