King Air 350

King Air 350 Lithium-ion Battery STC Kit

STC Partner
Technical Description
TB44 Lithium-ion Aircraft Battery, STC Documentation, Annunciator, Wire Harness, Mounting Hardware, Installation Kit
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TB44 Lithium-ion Battery Description

Reduce your aircraft battery weight by 40% with the TB44 Advanced Lithium-ion Aircraft Battery. Less weight means more passengers, more cargo, more fuel and more design flexibility. The True Blue Power lithium-ion battery is TSO certified, offers 2-year maintenance intervals, and lasts 8 years — 4x longer than lead-acid and NiCad batteries. A built-in heater ensures superior cold weather performance, down to -40°C.

Start Lighter

Cut aircraft battery weight and increase your useful load

  • Save up to 37 pounds per battery
  • Increase your useful load
    • More passengers
    • More cargo
    • More fuel
    • More design flexibility
  • Gain the most power per pound

Start Faster

Protect your engine and extend component life

  • Get cooler, faster engine starts
    • 7 starts in 7 minutes
  • Improve starter generator efficiency
  • Outperform all others in extreme temps, from -40°C to +70°C, with a built-in automatic heater
  • Fully recharge your battery within 30 minutes

Start Smarter

Get real-time state-of-charge and state-of-health information on demand

  • Receive constant monitoring, protection, and capacity data with our proprietary Battery Management System (BMS)
  • Save time and money with the longest lasting batteries on the market
    • 8-year average useful life — that’s 4x longer than lead-acid and NiCad batteries
  • 2-year maintenance interval
    • Save up to 90% on maintenance costs
TB44 Lithium-ion Battery Specifications
  • 46 amp-hour battery nominal at 23°C/73.4°F
  • Weighs 51.7 lbs. — 40% lighter than lead-acid or nickel-cadmium alternatives
  • Advanced Nanophosphate® lithium-ion cell chemistry — 3x the energy per kilogram when compared to lead-acid and nickel-cadmium cells
  • 7 engine starts in 7 minutes
  • 15 minutes for complete recharge when the battery is fully discharged on a typical aircraft
  • Superior performance at extreme temperatures (-40°C/-40°F to +70°C/+158°F)
  • Automatic internal heater
  • Overcharge, over-discharge, over-current, short circuit, over-temperature and under-temperature protection
  • Communicates ARINC 429 data to the cockpit
  • Higher voltage during engine start — Less wear, less maintenance and increased useful life
  • 2-year maintenance interval —50 – 90% savings on maintenance costs
  • Designed and built in Wichita, Kansas, USA
  • FAA TSO Certified
  • Two-year limited warranty

46 amp-hour nominal at 23°C/73.4°F

Charge Voltage
28 VDC nominal

Output Voltage
26.4 VDC nominal

Output Current
750 A continuous, 1500 A max

Advanced NanoPhosphate® lithium-ion cell chemistry

Overcharge, over-discharge, over-current, short circuit, over-temperature, under-temperature

Energy Density
52.0 Wh/kg
64.6 Wh/liter

Operating Temperature
-40°C to +70°C (-40°F to +158°F)

51.7 lbs. (23.4 kg)

10.9” L x 11.7” W x 10.1” H

8S19P; 8 series cells x 19 parallel modules

2-year maintenance interval; offers 50 – 90% savings on maintenance costs

Battery Life Expectancy
8 years (average)

Powder-coated steel, blue

FAA TSO certified to C179a
ETSO certified to C179a
RTCA DO-311 qualified
RTCA DO-160G qualified
UNDOT/IATA qualified

Product Comparison
Battery Technology Voltage Output Capacity (1C rate) Weight Maintenance Useful Life
True Blue Power TB44 Lithium-ion 26.4 VDC 46 amp-hour 51.7 lbs. 2 years 8 years (average)
Concorde RG-380E/44L Lead-acid 24 VDC 42 amp-hour 89.0 lbs. 1 year (annual)
3 – 6 months (subsequent)
2 – 4 years
Saft 4078-19 Nickel-cadmium 24 VDC 43 amp-hour 84.0 lbs. 200 – 400 hours 5 – 10 years
Product Comparison
True Blue Power TB17 Concorde RG-380E/44L Saft 4078-19
Battery Technology:
Battery Technology:
Battery Technology:
Voltage Output:
26.4 VDC
Voltage Output:
24 VDC
Voltage Output:
24 VDC
Capacity (1C rate):
46 amp-hour
Capacity (1C rate):
42 amp-hour
Capacity (1C rate):
43 amp-hour
51.7 lbs.
89.0 lbs.
84.0 lbs.
2 years
1 year (annual)
3 – 6 months (subsequent)
200 – 400 hours
Useful Life:
8 years (average)
Useful Life:
2 – 4 years
Useful Life:
5 – 10 years

The NanoPhosphate® Lithium-ion Advantage

Lithium-ion Battery Power


Superior power by weight or volume in a cost effective solution

Lithium-ion Battery Safety


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

Lithium-ion Battery Life


Excellent calendar and cycle life with consistent performance over extended use

Lithium-ion Battery Energy


Higher useable energy means greater battery utilization and lower cost