The 8S 1.2A Inductive Active Battery Balancer is designed to equalize voltage differences across eight series-connected lithium battery cells, helping maintain a more balanced battery pack during operation. Available at BDTronics Bangladesh, this compact PCB-based balancer uses inductive energy transfer to redistribute energy between cells, reducing voltage imbalance and minimizing unnecessary energy loss compared with conventional resistive balancing methods.

Suitable for compatible ternary lithium battery chemistries, including NCM and NCA, this 8S active equalizer automatically activates when the voltage difference between adjacent cells exceeds its specified threshold. With a balancing current of up to 1.2A, low standby current, and a 22AWG wiring harness, it is designed for battery pack assembly, energy storage projects, and custom lithium battery systems.

Features:

• 8S Battery Balancing: Designed for battery packs containing eight series-connected cells.

• Active Inductive Balancing: Transfers energy between cells to help reduce voltage differences with less energy dissipation than resistive balancing.

• Maximum Balancing Current of 1.2A: Provides a specified peak balancing current when cell voltage differences are sufficiently large.

• Automatic Balancing Activation: Starts balancing when the voltage difference between adjacent cells exceeds approximately 0.1V.

• Automatic Balancing Stop: Stops balancing when the adjacent-cell voltage difference falls below approximately 0.03V.

• Variable Balancing Current: Balancing current decreases as the voltage difference between cells becomes smaller.

• Low Standby Power Consumption: Specified static current consumption is up to 20μA.

• Low-Resistance MOSFETs: Designed to improve switching efficiency and reduce energy losses during energy transfer.

• Compact PCB Design: Suitable for integration into compatible battery packs and energy storage systems.

• 22AWG Wiring Harness: Provides individual battery connection leads for the eight series cells and pack negative terminal.

• Battery Voltage Equalization: Helps reduce cell voltage imbalance, supporting more consistent battery pack operation.

• Available at BDTronics: Suitable for compatible lithium battery balancing and energy storage projects in Bangladesh.

Specifications:

• Product Name: 8S Inductive Active Battery Balancer

• Product Type: Active inductive battery equalizer

• Brand: Generic / China

• Series Configuration: 8S (eight cells connected in series)

• Balancing Current: Up to 1.2A

• Balancing Current at Voltage Difference Above 0.1V: Approximately 0.5A–0.7A, according to supplied specifications

• Balancing Current at Voltage Difference Above 0.2V: Up to 1.2A, according to supplied specifications

• Balancing Start Threshold: Adjacent-cell voltage difference greater than approximately 0.1V

• Balancing Stop Threshold: Adjacent-cell voltage difference below approximately 0.03V

• Specified Cell Voltage Range: 2.0V–4.5V

• Supported Battery Chemistry: Compatible ternary lithium chemistries, including NCM and NCA, subject to cell voltage requirements

• LTO Battery Compatibility: Not compatible

• Maximum Static Current Consumption: 20μA

• Circuit Board Material: PCB

• Wiring Harness: 22AWG

• Connection Points: B−, B1, B2, B3, B4, B5, B6, B7, B8

Applications:

• 8S lithium-ion battery packs

• NCM and NCA ternary lithium battery systems

• Custom battery pack assembly

• Battery voltage equalization

• Compatible lithium energy storage systems

• Battery pack development and prototyping

• DIY lithium battery projects

• Electric equipment battery packs with compatible voltage configurations

• Battery maintenance and cell balancing projects

How an Inductive Active Balancer Works

Battery cells connected in series can develop different voltages because of variations in cell capacity, internal resistance, temperature, age, and charge or discharge history. Excessive cell imbalance can reduce the usable capacity of a battery pack and cause individual cells to reach their voltage limits before other cells.

An inductive active balancer uses electronic switching and inductive energy transfer to move energy between cells or cell sections. Instead of simply dissipating excess energy as heat through resistors, it redistributes energy to help reduce voltage differences.

The 8S balancer described here operates automatically according to the specified voltage difference thresholds:

• Voltage Difference Above 0.1V: Balancing begins when the difference between adjacent cells exceeds the specified activation threshold.

• Voltage Difference of Approximately 0.1V–0.2V: Balancing current is typically around 0.5A–0.7A under the stated conditions.

• Voltage Difference Above 0.2V: Balancing current can reach up to 1.2A under suitable operating conditions.

• Voltage Difference Below 0.03V: Balancing stops according to the specified cutoff threshold.

Actual balancing current and behavior depend on the circuit design, cell voltages, operating conditions, and manufacturer's specifications.

Wiring and Connection Guide

The balancer uses nine connection points to monitor an eight-cell series battery pack. Each connection must be attached to the correct battery node.

• B−: Connect to the negative terminal of Cell 1, which is the overall negative terminal of the battery pack.

• B1: Connect to the positive terminal of Cell 1.

• B2: Connect to the positive terminal of Cell 2.

• B3: Connect to the positive terminal of Cell 3.

• B4: Connect to the positive terminal of Cell 4.

• B5: Connect to the positive terminal of Cell 5.

• B6: Connect to the positive terminal of Cell 6.

• B7: Connect to the positive terminal of Cell 7.

• B8: Connect to the positive terminal of Cell 8, which is the overall positive terminal of the pack.

Installation Instructions

• Verify Battery Chemistry: Confirm that your battery cells are compatible with the balancer. This model is specified for compatible NCM/NCA ternary lithium cells and is not suitable for LTO batteries.

• Check Individual Cell Voltages: Measure the voltage of each cell before connecting the wiring harness. Confirm that every cell is within the specified 2.0V–4.5V range.

• Identify Battery Connection Points: Verify the complete series-cell wiring and each connection point before installation.

• Connect in the Correct Sequence: Follow the manufacturer's wiring diagram and connection sequence. Incorrect wiring can damage the balancer or create a battery short circuit.

• Verify Connections Before Power-Up: Use a multimeter to check the voltage between adjacent connection points and confirm that each connection corresponds to the correct cell.

• Secure the PCB: Mount the balancer securely, protect it against conductive debris, and provide suitable insulation and ventilation.

• Monitor Initial Operation: Check cell voltages and PCB temperature during initial operation to confirm that the system behaves as expected.

Important Compatibility and Safety Notes

• This is an active cell balancer, not a complete battery management system (BMS). It does not replace required overcharge, over-discharge, overcurrent, short-circuit, or temperature protection.

• The specified 2.0V–4.5V range refers to individual cell voltage, not total pack voltage.

• Eight series-connected cells can produce a hazardous total voltage, particularly when fully charged. Use appropriate insulation, tools, and protective measures.

• Do not connect the wiring harness based on wire colour alone. Confirm the actual pinout and manufacturer wiring diagram.

• Verify the exact supported chemistry and cell voltage limits before use. Do not use this unit with LTO batteries.

• The 1.2A figure is a maximum specified balancing current, not a guaranteed continuous current under all conditions.

• For battery packs used in critical or high-current applications, use a properly designed BMS and suitable electrical protection.

Package Includes:

• 1 × 8S Inductive Active Battery Balancer PCB

• 1 × 22AWG Wiring Harness

Why Buy from BDTronics?

BDTronics supplies electronics components, battery management accessories, embedded electronics, and power system components in Bangladesh. This 8S inductive active battery balancer is an option for compatible NCM/NCA lithium battery projects that require automatic cell voltage equalization.

Before purchasing from BDTronics, verify your battery chemistry, series configuration, individual cell voltage range, and balancer wiring requirements to ensure compatibility with your battery pack.

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