4S 2A Active Lithium Battery Equalizer Balance Board for Li-ion & LiFePO4 Battery Packs

The 4S 2A Active Lithium Battery Equalizer Balance Board is a high-performance battery balancing module designed to improve the efficiency, safety, and lifespan of 4-cell (4S) lithium battery packs. Unlike traditional passive balancing circuits that dissipate excess energy as heat, this active balancing board transfers energy from higher-voltage cells to lower-voltage cells, reducing energy loss and maintaining optimal cell voltage balance.

Supporting both Li-ion (3.6V/3.7V per cell) and LiFePO4 (3.2V per cell) battery packs, this module provides a balancing current of up to 2A, making it ideal for high-capacity battery packs, DIY battery projects, electric vehicles, solar energy storage systems, robotics, UPS systems, and portable power stations.

By continuously balancing cell voltages during charging, discharging, and storage, the board helps prevent overcharging of individual cells, increases battery efficiency, extends battery service life, and improves overall pack performance. It can be used alongside a compatible 4S Battery Management System (BMS) for complete battery protection and balancing.

Key Features

• Supports 4S Lithium Battery Packs (4 Cells in Series)
• Compatible with Li-ion (18650, 21700, 26650, 32700) and LiFePO4 batteries
• Active balancing technology transfers energy between cells instead of wasting it as heat
• Up to 2A balancing current for faster and more efficient balancing
• Improves battery capacity utilization and pack efficiency
• Extends battery cycle life by maintaining balanced cell voltages
• Low power consumption during operation
• Compact and lightweight PCB design
• Easy wiring and installation
• Ideal companion for 4S BMS protection boards

Applications

• DIY Lithium Battery Packs
• Electric Bicycles (E-Bikes)
• Electric Scooters
• Solar Energy Storage Systems
• UPS Battery Backup Systems
• Portable Power Stations
• Robotics Projects
• RC Vehicles
• Battery Repair & Maintenance
• Energy Storage Projects
• Industrial Battery Packs
• Medical Equipment Battery Packs

Specifications

• Product Type: Active Battery Equalizer / Balance Board
• Battery Configuration: 4S (4 Cells in Series)
• Balancing Current: Up to 2A
• Supported Battery Chemistry:
  • Li-ion (3.6V / 3.7V)
  • LiFePO4 (3.2V)
• Balancing Method: Active Energy Transfer
• Power Consumption: Low
• Installation: External Battery Balancer Module
• PCB Material: High-quality FR4
• Operating Mode: Automatic Continuous Balancing
• Protection: Balancing only (Use with a compatible BMS for charging/discharging protection)

Package Includes

• 1 × 4S 2A Active Lithium Battery Equalizer Balance Board
• 1 × Connection Cable Set (if included with the product)

Advantages of Active Balancing

• Much more efficient than passive balancing
• Minimal heat generation
• Conserves battery energy
• Improves battery pack consistency
• Increases usable battery capacity
• Reduces voltage differences between cells
• Extends overall battery lifespan
• Ideal for large-capacity battery packs

Why Choose This 4S Active Battery Equalizer?

Whether you're building a custom lithium battery pack or maintaining an existing one, this 4S 2A Active Lithium Battery Equalizer Balance Board offers an efficient solution for keeping all cells balanced. Its active energy transfer technology helps maximize battery performance, improve reliability, and significantly extend the life of your Li-ion or LiFePO4 battery pack. It is an excellent choice for DIY enthusiasts, battery pack manufacturers, solar energy systems, electric mobility projects, and industrial battery applications.