4S 6A Active Battery Balancer Board – Li-ion & LiFePO4 BMS

4S 6A Active Energy Transfer Balancer Board – Capacitive Type for 4-String Lithium Battery Packs

Keep your lithium battery pack performing at its peak with this 4S 6A Active Balancer Board. Using capacitive energy-transfer technology, it automatically redistributes charge between cells in a 4-string configuration — helping extend overall battery cycle life and maintain consistent cell voltages across NCM and LiFePO4 chemistries.

Key Features

• Dynamic Balancing Current: 0–6A, automatically adjusted based on the voltage differential between cells — no manual tuning required.
• Wide Compatibility: Supports NCM and LiFePO4 lithium cell chemistries within a 2.5–4.5V operating voltage range.
• Capacitive Energy Transfer: Efficiently shuttles energy from higher-voltage cells to lower-voltage cells, minimizing wasted heat compared to passive balancers.
• Low Idle Power Draw: Operating consumption of just 1.5mA–2.5mA keeps parasitic drain minimal when the pack is at rest.
• Compact PCB Design: Measures only 45 × 36mm — easy to integrate into existing BMS setups without adding bulk.
• Durable Construction: Plastic + metal build for reliable long-term use in DIY battery packs, solar storage, e-bikes, and more.

Specifications

⚠️ Important Wiring Notice

Correct wiring is essential. Incorrect connections may cause permanent damage to the board. Always double-check your wiring against the provided diagram before powering up. Wire length and voltage differential both influence balancing current — keep leads as short and equal in length as possible for optimal performance.

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What battery chemistries is this 4S active balancer board compatible with?

A: This 4S active balancer board supports both NCM (Nickel Cobalt Manganese) and LiFePO4 (Lithium Iron Phosphate) lithium cell chemistries, with an operating voltage range of 2.5V to 4.5V per cell — making it versatile for a wide range of DIY lithium battery pack builds.

Q: How does the active balancer differ from a passive balancer?

A: Unlike passive balancers, which dissipate excess cell energy as heat, this capacitive active balancer transfers energy from higher-voltage cells to lower-voltage cells. This means less wasted energy, less heat generation, and more efficient overall balancing — particularly valuable in higher-capacity battery packs.

Q: Does the balancing current need to be manually set?

A: No. The dynamic balancing current (0–6A) adjusts automatically based on the voltage differential between your cells. A larger voltage gap between cells results in a higher balancing current, while cells that are nearly equal in voltage will see minimal current flow. Note that wire length also influences the current, so keep your leads short and matched in length.

Q: Can I use this board with my existing BMS?

A: Yes. This active balancer is designed to work alongside a standard BMS (Battery Management System) for 4-string lithium packs. It handles cell-level balancing while your BMS manages overcharge, over-discharge, and short-circuit protection. Ensure your wiring is correct before powering the system.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.