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Model #: TS835

Emergency Power Supply

24.5 VDC, 4.5 Amp, Lithium-ion, 5 VDC output, TSO

Manufactured by Mid-Continent Instruments and Avionics for True Blue Power

Replacement for PS855-XX series

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  • Automatically provides 24.5 VDC power for critical or standby equipment in the event of aircraft power failure
  • 4.5 amp-hour NanoPhosphate® lithium-ion battery
  • Includes an integrated 5V output
  • Utilizes advanced NanoPhosphate® lithium-ion technology — an energy storage solution with superior safety and abuse tolerance compared to metal oxide lithium-ion chemistries
  • Maintains full charge by recharging during normal flight operations
  • Lightweight — 63% lighter than legacy lead-acid designs
  • Direct replacement for L-3 Avionics/JET PS-855 (same rack mount and connector)
  • Two-year maintenance schedule
  • 8-year (average) life expectancy
  • Designed and built in Wichita, Kansas USA
  • Two-year limited warranty
4.5 amp-hour battery nominal

Input Voltage
24 – 32 VDC, 15 amps max

Output Power
24.5 VDC nominal, 20 amps max
3.0 – 5.5 VDC adjustable lighting output, 5.0 amps max

4.8 lbs — 8 pounds lighter than legacy lead-acid designs

3.1” H x 12.7” L x 2.4” W (approximate)

Life Expectancy
8 years (average)

Factory replaceable fuse

Mating Connector

Rack Mount Installation
1/4 ATR rack

Optional Vent Kit
MCI P/N 9017983

Remote Test Switch
Remote-mounted self-test switch required
MCI P/N 9017176 or equivalent

Anodized aluminum, blue

FAA TSO C179a certified
EASA ETSO C179a certified
ANAC TSO C179a certified
Part 23 AML STC certified
RTCA/DO-160F qualified
RTCA/DO-311 qualified

The TS835 Series is designed to supply DC power to the aircraft in the event of a primary system power loss. The True Blue Power emergency power supply features an advanced NanoPhosphate® lithium-ion cell chemistry that offers significant advantages over lead-acid designs, including a 63% weight savings, reduced maintenance costs and an improved life expectancy.

During normal aircraft operation, the emergency power supply uses the aircraft’s primary power bus to recharge or maintain existing charge at full capacity.

MD835-5 Installation Manual
MD835-5 Technical Drawing
Safety Data Sheet
Advanced Lithium-ion Battery Support Guide*


Service Bulletins

*In order to view embedded attachments, please download this PDF and open it using Adobe Acrobat Reader or another PDF reader.

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