Aircraft Battery 20GNG40(24V/40Ah) , substitution of Russian aviation battery K8 aircraft, Russian Mi-17/171

 Features 

1. Extreme Environment Performance: Unmatched reliability in harsh conditions, from arctic cold to desert heat. Performance is not significantly degraded at low temperatures.

2. Robustness and Durability: Built to withstand severe vibration, shock, and mechanical stress inherent in aviation operations.

3. Overcharge Tolerance: The Cd-Ni chemistry is highly resistant to damage from prolonged overcharging, a critical safety factor in aviation electrical systems.

4. Deep Discharge Recovery: Can be fully recovered from a complete discharge (even to 0V) by applying a standard charge cycle, with no permanent damage.

5. Maintainability: Individual cells can be serviced, tested, and replaced if necessary, extending the overall life of the battery pack.

6. Proven Direct Replacement: Certified and designed to be a form-fit-function substitute for the original K8 battery, ensuring seamless integration without aircraft modification.

Specifications

Applications

• Aircraft Engine Starting: Primary power source for turbine engine ignition in Mi-17/171 helicopters.

• Emergency Backup: Powers avionics, lighting, and communication systems during generator failure.

• Ground Support: Used in ground power units (GPUs) for aircraft servicing.

• Military & Aviation: Certified for use in harsh environments (e.g., high vibration, temperature swings).

Performance Characteristics

• Operating Temperature Range: -40°C to +55°C

• Storage Temperature Range: -50°C to +50°C

• High-Rate Discharge: Capable of delivering very high current pulses (e.g., 800A - 1000A) required for turbine engine starting.

• Cycle Life: Excellent deep-cycle capability, typically exceeding 1000 cycles under proper maintenance.

• Service Life: Long operational life (15+ years) due to the robust nature of Cd-Ni chemistry.

• Shelf Life: Indefinite if stored properly in a discharged state; no permanent sulfation occurs.

Warnings & Precautions

 Charging

• Use a charger specifically designed for Cadmium-Nickel (Ni-Cd) aviation batteries.

• Constant Current Charging: A typical charge rate is 8A (0.2C) for 7-8 hours.

• Float Charging: For ground support units (GPU), a float voltage of 28.0 ± 0.2V (for a 24V system) is commonly used to maintain the battery without overcharging.

• Gassing: Normal gassing (hydrogen and oxygen evolution) occurs during charging. Charge only in well-ventilated areas away from sparks or open flames.

Discharging

• Avoid Deep Discharge: Do not discharge below 1.0V per cell (20V for pack) to prevent cell reversal damage.

• High-Current Limits: Limit continuous discharge to 20C5A (800A) and peaks to 30C5A (1,200A) for ≤3 seconds.

Storage

• Partial Charge Storage: Store at 30–50% state of charge (SOC) in a cool, dry environment.

• Recharge Interval: Recharge every 3 months if stored for extended periods.

Safety

• Short Circuit Prevention: Insulate terminals when not in use; high currents can cause arc flashes.

• Transportation: Comply with IATA/ICAO regulations for hazardous materials (UN 2795, Alkaline Batteries).

• Disposal: Cadmium is toxic. Recycle through authorized facilities only. Do not dispose in landfills .