Battery Maintenance and Test

Battery Equalizer 2-24S 15A Intelligent Active Balancer For Lithium Battery

This is a tailor-made equalization management system for high-capacity series-connected battery packs. It can be used in the battery pack of small sightseeing cars, mobility scooters, shared cars, high-power energy storage, base station backup power, solar power stations, etc., and can also be used for battery equalization repair and restoration.

This equalizer is suitable for 2~24 series NCM/ LFP/ LTO battery packs with voltage acquisition and equalization functions. The equalizer works with a continuous 15A equalization current to achieve energy transfer, and the equalization current does not depend on the voltage difference of the series-connected cells in the battery pack. The voltage acquisition range is 1.5V~4.5V, and the precision is 1mV.

Product Detail

Product Tags


2-24S 15A

Product Information

Brand Name:  HeltecBMS
Material: PCB board
Origin:  Mainland China
Warranty: One year
MOQ: 1 pc
Battery Type: NCM/ LFP/ LTO


  • Customized logo
  • Customized packaging
  • Graphic customization


1. Battery equalizer*1set.

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/Brazil
    Contact Us to negotiate shipping details
  • Payment: TT is recommended
  • Returns & Refunds: Eligible for returns and refunds


  • Super-capacitors as medium to achieve active energy transfer equalization
  • Continuous 15A equalization current
  • Equipped with Bluetooth and phone APP software
  • Fast and simultaneously balancing

Working Principle

The equalization process of this active equalizer consists of the following three steps, which are cycled sequentially until the maximum differential pressure is within the set range:

1. Detecting the largest and smallest monomers;
2. Maximum monomer charging to the super-capacitor of the equalizer, charging current is the set current, maximum 15A;
3. The super-capacitor of the equalizer discharge to the smallest monomer, discharging current is the set current, maximum 15A;
4. Repeat steps 1 to 3 until the differential pressure is within the set range.

Main Technical Indicators



Applicable Number of Strings


Cascade Connection


Size (mm)


Net Weight (g)


Reserved Battery Protection

Support disordered power-up detection/protection

External Power Supply

DC 12-120V

Applicable Battery Type


Voltage Acquisition Range


Undervoltage Protection - Hibernation Voltage

Customizable settings on APP:1.5-4.2V.

Equalization Method

Single-channel transfer separately, point-to-point energy transfer.

Voltage Equalization Precision

Customizable settings on APP: 1mV (typical value)

Whether External Power Supply is Required

Battery power available (precision: 3mV),

external power (precision: 1mV)

Power-down Detection Function


Wrong Wiring Protection Function


Malfunction Alarm Function



Customizable settings on APP

Power Consumption

When the equalization system working≈1W, the equalization system closed≈0.5W.

Working Environment Temperature

-20℃~ +45℃

The Strategy of Capacity Equalization

In order to deal with the situation of excessive energy transfer when the capacity difference is relatively small, the 15A equalizer has designed an equalization strategy to deal with this situation. When the equalization cycle is finished, the original smallest cell becomes the largest cell and the largest cell becomes the smallest cell, and the equalizer waits for 3 minutes to let the battery voltage have a recovery time. If the largest cell becomes the smallest cell and the smallest cell becomes the largest cell after the 3-minute period, it means that the equalization has been over-equalized, and at this time the equalizer will reduce the equalization current by half, for example, the original equalization current is 15A, but now it is reduced to 7.5A. The equalizer automatically reduces the equalizing current by half. If there is still an over-equalization situation, continue to reduce the equalization current until the pressure difference is within the set range.

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