Military Grade Expansion Battery Pack | -40 °C to +55 °C Operating Temperature

The BAT-0400-H-1U Series is a military-grade expansion battery pack that uses lithium polymer batteries and highly efficient power electronic circuitry to achieve a high power level and battery run-time in a low-profile, low-weight, rack-mountable package. It is designed specifically for use with SynQor UPS-1250, UPS-1500 and UPS-3000 series uninterruptible power supplies (UPS). It is designed for the extreme environmental and demanding electrical conditions of Military/Aerospace applications.

The pack cannot be used as a standalone battery. Multiple layers of circuit protection are implemented internal to the battery pack. Features include heater resistors for operating down to -40°C ambient, and internal hardware protection and status monitoring.

The BAT-0400-M pack provides cold-start operation down to -40°C. A cold-start is an enable of the UPS using only battery power, with no input power available. Below -20°C, following a cold-start enable command from the user, the BAT-0400 will pre-heat itself to operational temperature, then enable the UPS output.

From a start with the battery pack soaked at -40°C, the cold-start pre-heat takes 3.5 minutes. The pre-heat terminates based on internal cell temperatures, so a cold-start from a temperature warmer than -40°C will take less than 3.5 minutes. Although operation at full output load requires a full pre-heat sequence, the user can optionally set the pre-heat to terminate early if the output load is known to be less than full load.

Specification Compliance

When installed inside a UPS-1250/1500/3000, the system is designed to meet:

• MIL-STD-1399-300B – Interface Std for Shipboard Systems
• MIL-STD-810G – Environmental Engineering Considerations
• MIL-STD-461F – Electromagnetic Interference
• MIL-STD-704F – Aircraft Electrical Power Characteristics
• MIL-STD-1275D – Vehicle Electrical Power Characteristic

Compatible with UPS-1250, UPS-1500 & UPS-3000 models

Weight5.35239 kg


  • Total Pack Output Voltage
  • Internal Pack Voltage
  • Total Voltage of Series-Connected Cells
  • Individual Cell Voltages
  • Status of Charge and Discharge Protection Switches
  • Total Pack Output Current
  • Internal Pack Current
  • Cell Temperatures
  • PCB Temperatures


Discharge Protection

  • Cell Under-Voltage Lockout, Software
  • Cell Under-Voltage Lockout, Hardware
  • Cell Under-Voltage Lockout Timer
  • Excessive String Current
  • String Short-Circuit Current
  • Excessive Pack Current
  • Detection of UPS Chassis Installation
  • Cell Temperature Too Hot for Discharge
  • Cell Temperature Too Cold for Discharge
  • PCB Temperature Too High

Charge Protection

  • Cell Over-Voltage Lockout, Software
  • Cell Over-Voltage Lockout, Hardware
  • Cell Over-Voltage Lockout Timer
  • Excessive Charging Current
  • Total String Voltage Too Low
  • Detection of UPS Chassis Installation
  • Cell Temperature Too Hot for Charging
  • Cell Temperature Too Cold for Charging
  • PCB Temperature Too High

String Heater Overrides

  • Timeout
  • PCB Temperature
  • Measured Pack Voltage
  • Any Cell Temperature

Ask for Assistance

Selecting the right power supply for your application is not a small task. Let our technical sales engineers guide you through the process of choosing the right solution for your needs.

Below some parameters usually required to size and select the right power supply:

  • Power & control requirements
  • Output & Input Voltage / Multioutput Voltage / Variable Voltage
  • Redundancy level
  • Mounting
  • Inrush Current
  • Environmental specifications (Temperature, altitude, vibration, shock)
  • Specific Industries Standards (Railway, Military, Medical)
  • Terminals

Contact Our Team

Contact our team of experienced engineers to discuss your unique power conversion and backup needs. We offer a wide range of highly reliable components that can be integrated and customized to create a solution that meets or exceeds your requirements.

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