Heltec 5.5a 6s Balancer and display

Heltec DS1004 Display Active Balancer – 6S (NCM / LFP / LTO)

The Heltec DS1004 Display Active Balancer is a 6-series (6S) intelligent active balancing module with an integrated voltage display, designed for lithium battery banks requiring precise cell equalisation and real-time monitoring.

Unlike standard non-display balancers, this version provides live cell voltage visibility, allowing users to observe pack behaviour during charge, discharge, and balancing cycles without external diagnostic equipment.

Technical Specifications

Product Model: DS1004 (Display Version)
Series Configuration: 6S
Supported Chemistries:

• NCM (Ternary Lithium)

• LFP (LiFePO4)

• LTO (Lithium Titanate)

Operating Voltage Range:

• NCM / LFP: 2.7V – 4.2V

• LTO: 1.8V – 2.7V

Balance Voltage Accuracy:

• ±5mV (typical)

Maximum Balance Current:

• Up to 5A–5.5A (when cell delta ≈ 1.0V)

• Current automatically tapers as voltage difference decreases

• Minimum balance start differential: 0.01V

Undervoltage Sleep Protection:

• NCM / LFP: 2.7V

• LTO: 1.8V

• Automatically enters protection sleep below threshold

Static Working Current:

• Approx. 20mA

Sleep Mode Current:

• <0.1mA

Operating Temperature Range:

• -10°C to +60°C

External Power Requirement:

• None – powered through internal energy transfer within the battery pack

Display Functionality (Key Difference)

The integrated display provides:

• Individual cell voltage monitoring

• Real-time voltage delta observation

• Visual confirmation of balancing activity

• Immediate identification of drift or abnormal cell behaviour

This makes it particularly useful in high-performance battery banks where monitoring voltage spread is critical.

Working Principle

The DS1004 uses a capacitive energy transfer active balancing architecture.

Instead of dissipating excess energy as heat, the system:

• Transfers charge from higher-voltage cells

• Redistributes energy to lower-voltage cells

• Engages the entire battery group simultaneously in the balancing process

This method improves efficiency and maintains pack consistency without resistive bleed loss.

Hardware Construction

• Ultra-low internal resistance MOSFET design

• 2oz copper thickness PCB for high current handling

• Three-proof conformal coating:

  • Moisture resistant

  • Dust resistant

  • Corrosion resistant

  • Shock resistant

  • Anti-aging and insulation protected

Application Suitability

Designed for:

• 6S lithium battery banks

• LTO banks operating in 1.8V–2.7V per cell ranges

• Performance systems requiring voltage consistency

• Installations where live voltage visibility is required