NEEY ACTIVE BALANCER 4S 2A (NEEY) (7421)

Description

NEEY Active Balancer 4S 2A – (NEEY 7421)

High-Efficiency 4S Lithium Battery Active Balancer – 2A Equalization Current

The NEEY Active Balancer 4S 2A (7421) is a precision active balancing module designed for 4-series (4S) lithium battery packs. It provides fast and efficient 2A active balancing, redistributing energy from higher-voltage cells to lower-voltage cells to maintain pack uniformity, extend battery life, and improve performance.

This active balancer is ideal for Li-ion, LiFePO₄ (LFP), or LTO chemistry batteries and is perfect for small-scale energy storage, DIY battery packs, e-bikes, portable power stations, and other 4S applications.

Key Features

• Supports 4S lithium battery packs (4 cells in series)

• 2A active balancing current for efficient equalization

• Works with multiple chemistries: Li-ion, LiFePO₄ (LFP), LTO

• Transfers energy between cells instead of wasting it (active balancing)

• Maintains cell voltage balance and extends battery lifespan

• Reduces heat compared to passive balancing

• Compact and easy-to-install design

• High-quality NEEY PCB and components for long-term reliability

Applications

Ideal for small lithium battery packs, including:

• Portable power stations and energy storage units

• Small solar battery systems

• E-bikes and electric scooters (4S packs)

• DIY 4S battery projects

• Low-voltage Li-ion or LFP battery management

Installation Tips

• Connect all 4 balance leads properly before powering on.

• Use in parallel with an existing BMS if applicable.

• Keep the balancer module ventilated during operation.

• Avoid reverse polarity connections to prevent damage.

• Use matched cells for best balancing performance.