EarthX ETX-900 TSO 14V Aircraft Lithium Battery

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Part# 11-18242
MFR Model# ETX900-TSO


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Note: STC is not provided by EarthX Batteries

The ETX900-TSO Certified Aircraft battery is only 5.4 pounds and can be used in an aircraft that has an alternator/generator with 80 amps output or less. This battery has electronic protections (BMS) and built in thermal runaway containment and venting with 2 venting tubes that are 3 feet in length each. The ETX900-TSO meets all of the DO-311a and DO-160 requirements for a lithium battery in aircraft.

The battery also has an LED battery fault light indicator on the battery itself plus it can be programed into your EFIS or wired to an LED on your panel. The fault indicator alerts you to the state of charge and state of health of the battery.


  • The battery management system (BMS) protects the cells from:
    • over discharge
    • over charge
    • short circuit
    • excessive cranking
    • cell balancing technology
    • these protections are redundant for another layer of protection.


FAA Required Statement:
  • “The conditions and test required for TSO approval of this article are minimum performance standards. Those installing this article either on or within a specific type or class of aircraft must determine that the article installation conditions are within the TSO standards. The article may be installed only according to 14 CFR part 43 or the applicable airworthiness requirements.”
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February 22, 2022


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this EarthX ETX-900 TSO battery a replacement battery for Cessna U206B?

It has the correct power specs for the aircraft but it would need a 337 for install.

Q: So, who provides the STC with the EarthX ETX-900 battery?

As the first company to achieve the goal of receiving approval on a lithium battery, EarthX has what is called a FAA TSOa certification. We hold the design approval and manufacturing approval to produce this battery. At release, we will not have any Supplemental Type Certificate (STC)s yet. For you to install this in your aircraft, you will need to get a field approval with FAA Form 337 for your aircraft or wait for the STCs to follow.

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