Emergency Power Supply

The TS835 Series Emergency Power Supply features an advanced Nanophosphate® lithium-ion cell chemistry that offers distinct advantages over older, lead-acid designs. This includes a 63% weight savings, reduced maintenance costs and an improved 10-year life expectancy.


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Installation Manual
IM 9016798

Technical Drawing
OL MD835

Safety Data Sheet

Service Bulletins
SB MD835-01

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A123 Systems Learn more about A123


  • Lightweight — 63% lighter than legacy lead-acid designs
  • Direct replacement for L-3 Avionics/JET PS-835 or PS-855 (same rack mount and connector)
  • Two-year maintenance schedule
  • 10-year life expectancy
  • Designed and built in Wichita, Kansas USA
  • Two-year limited warranty
  • 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
  • The TS835-5 includes an integrated 3.0 – 5.5 VDC adjustable output
  • Utilizes A123 Systems’ 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

The Nanophosphate® Advantage

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Superior power by weight or volume in a cost effective solution


Nanophosphate® is stable chemically, providing the foundation for safe systems


Excellent calendar and cycle life with consistent performance over extended use


Higher useable energy means greater battery utilization and lower cost

Product Comparison

Model Number Voltage Output Capacity (1c rate) Weight Maintenance Life Expectancy
TS835-1, TS835-5 24.5 VDC 4.5 amp-hours 4.8 lbs 2 years 10 years
J.E.T. PS-835, PS-855 24.0 VDC 4.2 amp-hours 13.0 lbs 1 year 3 years

Technical Specifications

Model Number TS835-1 TS835-5
Part Number MD835-1 MD835-5
Capacity 4.5 amp-hour battery nominal
Input Voltage 24 – 32 VDC, 7.0 amps max
Output Power 24.5 VDC nominal, 20 amps max 24.5 VDC nominal, 20 amps max

3.0 – 5.5 VDC adjustable
lighting output, 5.0 amps max

Weight 4.8 lbs — 8 pounds lighter than legacy lead-acid designs
Dimensions 3.1” H x 12.7” L x 2.4” W (approximate)
Life Expectancy 10 years
Protection Factory replaceable fuse
Mating Connector DPXB13-33S-0001 (MCI P/N 9016600-2 or 9016600-5)
Rack Mount Installation 1/4 ATR rack (MCI P/N 5120-107-C01)
Optional Vent Kit MCI P/N 9017983
Remote Test Switch Remote-mounted self-test switch required
MCI P/N 9017176 or equivalent
Case Anodized aluminum, blue
Certification 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