Heltec 5.5a 6s Balancer

The Heltec DS1004 Active Balancer (Standard Version) is a high-efficiency 6S energy-transfer balancing module designed for lithium battery banks that require stable cell voltage equalisation without external display hardware.

This unit is built specifically for applications where automatic cell correction and electrical stability are the priority, rather than live voltage readout.

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Core Function

The DS1004 standard balancer automatically redistributes energy between cells to minimise voltage spread across the pack.

It operates continuously once connected and does not require external programming or manual adjustment.

Unlike passive balancing systems that burn off excess voltage as heat, this balancer uses active capacitive energy transfer to move charge from higher-voltage cells to lower-voltage cells, improving efficiency and reducing thermal loss.

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Technical Specifications

Model: DS1004 (Standard Version – No Display)
Series Configuration: 6S
Supported Battery Chemistries:

• NCM (Ternary Lithium)

• LFP (LiFePO4)

• LTO (Lithium Titanate)

Operating Voltage Range:

• NCM / LFP: 2.7V – 4.2V

• LTO: 1.8V – 2.7V

Balancing Accuracy:

• ±5mV (typical)

Maximum Balancing Current:

• 5A–5.5A when cell delta ≈ 1V

• Current reduces proportionally as voltage differential decreases

• Minimum activation differential: 0.01V

Undervoltage Sleep Threshold:

• NCM / LFP: 2.7V

• LTO: 1.8V

• Automatically enters low-power sleep below threshold

Static Operating Current:

• Approx. 20mA

Sleep Mode Current:

• <0.1mA

Operating Temperature:

• -10°C to +60°C

External Power Requirement:

• Not required – unit operates via internal energy transfer within the battery pack

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How It Works

The DS1004 uses a capacitor-based energy transfer system:

1. Detects voltage difference between cells

2. Moves charge from higher-voltage cells

3. Transfers energy directly into lower-voltage cells

4. Reduces voltage spread across the full 6S pack

Because the entire battery group participates simultaneously, balancing is continuous and efficient.

This architecture is particularly suited to lithium packs with frequent charge/discharge cycling.

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Construction & Reliability

• Ultra-low internal resistance MOSFET design

• Heavy 2oz copper PCB for improved current handling

• Three-proof conformal coating for:

  • Moisture resistance

  • Dust protection

  • Corrosion resistance

  • Vibration resistance

  • Insulation durability

The board is designed for permanent installation inside battery banks operating in automotive and high-vibration environments.

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When to Choose the Standard Version

Choose this model if:

• You do not require integrated voltage display

• You already monitor pack voltage externally

• You want a dedicated internal balancing solution

• You prefer minimal hardware footprint

If live cell monitoring is required, the Display Version is more appropriate.