The Heltec 4S 5A Active Balancer Equalizer is a high-efficiency energy transfer balancing module designed for 12V lithium battery packs, including LiFePO4, Li-ion, and Lithium Titanate batteries.

This active equalizer intelligently redistributes energy between cells to maintain optimal voltage balance across the entire battery pack, significantly extending battery life and improving overall performance. Unlike passive balancers, this active balancer transfers energy directly from high-voltage cells to low-voltage cells using a capacitive energy transfer method, ensuring minimal energy loss and higher system efficiency. With balancing current up to 5A (adaptive up to 6A) and ultra-high voltage accuracy within ±5mV, it is ideal for high-capacity battery systems used in electric vehicles, RVs, solar energy storage, and backup power systems in Bangladesh.

Features:

• Active balancer with capacitive energy transfer equalization

• Supports 3S and 4S lithium battery packs

• Compatible with LiFePO4, Li-ion, and Lithium Titanate batteries

• High equalization current up to 5A, adaptive up to 6A

• Transfers energy across the entire battery group, not limited to adjacent cells

• High balance accuracy within ±5mV for precise voltage control

• Ultra-low internal resistance MOSFETs for reduced heat and losses

• High-quality 2oz copper PCB for improved current handling

• Adaptive equalization current increases with higher cell imbalance

• Low power consumption with dormant power-off mode

• Automatic operation with no configuration required

Specifications:

• Battery Configuration: 3S / 4S

• Working Voltage Range: 1.8V – 4.5V per cell

• Equalization Current: 0 – 6A (adaptive based on voltage difference)

• Typical Balancing Current: Up to 5A

• Balance Voltage Accuracy: Within 5mV

• Quiescent Current: Approx. 11–12mA

• Idle Current (Dormant Mode): Less than 0.1mA

• Recommended Battery Capacity: 60Ah – 300Ah

• PCB Copper Thickness: 2oz

• Equalization Method: Capacitive energy transfer

Working Principle

• The balancer continuously monitors the voltage of each cell

• When voltage imbalance is detected, energy is transferred from higher-voltage cells to lower-voltage cells

• Capacitive energy transfer ensures efficient redistribution with minimal heat generation

• Equalization operates automatically once connected to the battery pack

• Adaptive current control adjusts balancing strength based on imbalance severity

• Dormant mode activates when voltage balance is achieved to save power

Applications

• 12V LiFePO4 battery packs

• Electric vehicles and electric bikes

• RV and camper battery systems

• Solar energy storage systems

• Home energy storage and backup power

• Marine battery systems

• DIY lithium battery pack building

• High-capacity lithium battery management systems

How to Use

• Connect the balancer wires to each cell according to the correct sequence

• Ensure proper polarity before powering the system

• The balancer starts equalization automatically after connection

• No software or configuration is required

• Use alongside a BMS for complete battery protection

• Monitor battery voltages periodically for optimal performance

Product Instructions

• Verify battery chemistry and cell count before installation

• Do not connect to battery packs exceeding supported voltage range

• Ensure secure wiring connections to prevent voltage sensing errors

• Install in a well-ventilated area

• Avoid short circuits during installation

• Recommended for battery packs between 60Ah and 300Ah

• This device is for balancing only, not a replacement for a full BMS

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