Transformer Balancer

Transformer 5A 10A 3-8S Active Balancer For Lithium Battery

The lithium battery transformer balancer is tailor-made for the charging and discharging of large-capacity series-parallel battery packs. There is no requirement for voltage difference and no external power supply to start, and the balance will start after the line is connected. The equalizing current is not a fixed size, the range is 0-10A. The size of the voltage difference determines the size of the equalizing current.

It has the whole set of full-scale non-differential equalization, automatic low-voltage sleep, and temperature protection. The circuit board is sprayed with conformal paint, which has excellent performances such as insulation, moisture resistance, leakage prevention, shock resistance, dust resistance, corrosion resistance, aging resistance, and corona resistance, which can effectively protect the circuit and improve the safety and reliability of the product.

Product Detail

Product Tags




5A Hardware Version

5A Hardware Version

5A Smart Version

10A Hardware Version

10A Hardware Version

10A Smart Version

Product Information

Brand Name: HeltecBMS
Material: PCB board
Origin: Mainland China
MOQ: 1 pc
Battery Type: LFP/NMC/LTO
Balance type: Transformer Feedback Balancing


  • Customized logo
  • Customized packaging
  • Graphic customization


1.  Transformer balancer *1.
2. Anti-static bag, anti-static sponge and corrugated case.

Purchase Details

  • Shipping From:
    1. Company/Factory in China
    2. Warehouses in United States/Poland/Russia/Spain/Brazil
    Contact Us to negotiate shipping details
  • Payment: TT is recommended
  • Returns & Refunds: Eligible for returns and refunds

Working Principle

The circuit board is equipped with an aluminum heat sink, which has the characteristics of fast heat dissipation and low temperature rise when working with high current. This product is suitable for ternary lithium, lithium iron phosphate, and lithium titanate batteries. The maximum balancing voltage difference is 0.005V, and the maximum balancing current is 10A. When the voltage difference is 0.1V, the current is about 1A (its actually related to the capacity and internal resistance of the battery). When the battery is lower than 2.7V (ternary lithium/lithium iron phosphate), it stops working and enters dormancy, with over-discharge protection function.

Bluetooth Module

  • Dimension: 28mm*15mm
  • Working frequency band: 2.4G
  • Working voltage: 3.0V ~ 3.6V
  • Transmit power: 3dBm
  • Reference distance:10m
  • Antenna interface: built-in PCB antenna
  • Receiving sensitivity: -90dBm

TFT-LCD display

Dimension: 77mm*32mm

Front side introduction:

Name Function
S1 Voltage of the 1st string
S2 Voltage of the 2nd string
S3 Voltage of the 3rd string
S4 Voltage of the 4th string
In the circle Total voltage
White button Screen off status: Press to turn on the screenScreen on status: Press to turn off the screen

Back side introduction:

Name Function
A Turn this DIP switch to change the display direction of the screen content.
B Se to ON: the display is always on.Set to 2: the display will automatically turn off after ten seconds without any operation.

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