A+ A A-
BAT-NiMh45: 45Ah NiMh Backup Module

BAT-NiMh45: 45Ah NiMh Backup Module

Manufacturer: Tri-M Technologies



NiMh Battery Backup Module for HESC, V5SC & HPSC Series Power Supplies

The BAT-NiMh45 creates a UPS system by plugging directly into the bottom of the HESC (including the V5SC-SER & HPSC) Vehicle Power Supplies. Each BAT-NiMh45 includes seven 4.5Ahr "A" size batteries for a nominal backup voltage of 8.4 volts. The BAT-NiMh45 can therefore supply a total of 37.8 watt-hrs of backup power and supply backup power for up to sixty minutes for a 37.8 watt load.

The BAT-NiMh45 includes Mosfet transistors for preventing deep discharge occurrences during extended power outages. The Mosfet transistors electrically isolate the BAT-NiMh45 from the HESC whenever the BE output of the HESC is de-asserted (pulled to 5V).

When ordered with the Real Time Clock option, the BAT-NiMh45-RTC can "awaken" from Sleep Mode at a programmed start-up time. A momentary "dry" contact on CN3 can also override the Sleep Mode and awaken the BAT-NiMh45-RTC. Tri-M Power supplies supporting the HESC-UPS18 firmware can program and read the RTC on the BAT-NiMh45-RTC. Tri-M Power Supplies with HESC-UPS firmware can use the BAT-NiMh45 for a UPS system, but without RTC support. Refer to section "Configuration and Installation" for listing of compatible power supplies and firmware support.

The BAT-NiMh45 has both a thermal fuse and a current fuse for protection against overcharging, and shorts on the battery output.

A digital I2C temperature sensor provides temperature feedback for charge termination, which can be read by the HESC.


  • Allows graceful system shutdown
  • Combine with a Power/OS power supply for full UPS functionality
  • PC/104 stackable
  • Nickel Metal Hydride batteries
  • Digital I2C temperature sensor for detecting battery temperature


Electrical Specifications

  • Batteries: NiMh, Size A, 4.5A-Hr.
  • Nominal Battery Voltage: 8.4 volts (seven cells * 1.2 volts)
  • Maximum Capacity: 37.8 watt-hours
  • Max Charging Current 4.0A
  • Max Charging Voltage 19.5V


  • Charging Temperature Range 0°C to 45°C
  • Discharge Temerature Range -10°C to 64°C


  • PC/104 footprint size: 3.55" x 3.775", no PC/104 bus
  • Weight: 521 grams (including mounting hardware)


File Type Description
BATNiMh45-Spec-Sheet.pdf Spec Sheet BAT-NiMh45 Spec Sheet
batnimh45_man.pdf User Guide BAT-NiMh45 Manual

Ordering Info

Part Number Description
BAT-NIMH45-PBF PC/104 size, NiMh battery pack, 4.5Ah
Accessories and Options
CH Humiseal conformal coating and epoxy
CS Silicon conformal coating and epoxy
CU Urethane conformal coating and epoxy


Please log in to write a review.

By Email

By Phone

Toll Free: 800.665.5600 (North America)
Direct: 604.814.5069
Fax: 888.831.5149

By Mail

Tri-M Technologies Inc.
208 – 31510 Gill Avenue
Mission, BC, Canada  V4S 0A1

Login or Register