McFarlane Aviation Products - ETX900-TSO-35-M20-KIT BUNDLE

Part Number: ETX900-TSO-35-M20-KIT BUNDLE


Eligibility Notice

Please verify that this product is eligible for your aircraft before adding it to your cart.

Click here to view product eligibility.

Product Details

FAA-TSO EarthX Batteries


Note - No hazmat fee charge, unless quantity results in shipment exceeding 300 Watt hrs. Fee for international shipments may apply.


ETX900-TSO Battery
Panel Mount LED
Fault Light Indicator Placard
Tubing (3/8")
Tubing (1/4")
Grommet (3/8")
Wye Tube Fitting (3/8")
Battery Cable

STC Paperwork included with installation kit!


Used for replacing a Concord or Gill 35Ah battery.


The FAA approved 12V ETX900-TSO designed for certified aircraft. An STC or DER assisted Part 337 (field approval) is required for installation.

This aircraft battery has electronic protections (BMS) and built in thermal runaway containment and venting ability built in. The ETX900-TSO meets all of the DO-311a and DO-160 requirements for a lithium battery in aircraft.

Our ETX battery series is fully protected by an integrated battery management system (BMS) that protects the cell’s from over discharge, over charge, short circuit, temperature, plus cell balancing to ensure charge levels are equal. Additionally, our ETX Hundred series aircraft batteries have redundant electronic circuits and battery fault indication. This battery also has fault indication that 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. (Please see manual for details)




“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.”


EarthX Batteries use Lithium Iron Phosphate chemistry to deliver powerful starting energy. This chemistry provides the highest, most robust performance and safest power on the market. All EarthX Batteries come standard with a BMS (battery management system) for performance, safety, and longevity.



  • Weight reduction, 80% lighter than lead-acid equivalent
  • Speedy charging
  • Use your existing battery box
  • Long-lasting utility
  • Flexible mounting
  • Environmentally friendly interior
  • Lithium iron phosphate, most abuse tolerant chemistry
  • Fire retardant foam insert included with installation kit


**View Eligible Aircraft tab to verify applicability for your aircraft. 


Battery Only
Battery + Installation Kit + STC
Aviat A-1 Series
Cessna 120, 140, 150-150C
Cessna P172D
Cessna 175-175C
Cessna 177A,B,RG
Cessna 180-180K
Cessna 182A-182Q
Cessna 185-A185F
Mooney M20E-M20K
Piper PA12, PA32
Piper PA28-PA28RT
Piper PA18, PA20, PA22, PA24 w/35Ah Battery Box
Piper PA18, PA20, PA22, PA24 w/25Ah Battery Box

**Note: EarthX Batteries and installation kits containing a battery are Hazmat Code 9. See EarthX SDS for additional information. 


Eligible Aircraft

Make Series Model Beginning S/N Ending S/N Eligibility Chart
Mooney M20 M20E 21-0001 21-1180 7853
Mooney M20 M20E 470 1308 7853
Mooney M20 M20E 690001 690073 7853
Mooney M20 M20E 700001 700061 7853
Mooney M20 M20F 22-0001 22-1439 7853
Mooney M20 M20F 660002 660004 7853
Mooney M20 M20F 670001 670539 7853
Mooney M20 M20F 680001 680206 7853
Mooney M20 M20F 690001 690092 7853
Mooney M20 M20F 700001 700072 7853
Mooney M20 M20J 24-0002 24-2999 7853
Mooney M20 M20K 25-0001 25-0999 7853

Frequently Asked Questions

My battery is dead or near zero volts, how do I recharge it?
How do I know when it is time to replace my (LFP) lithium battery?
My LED light is flashing on my ETX680C/680, ETX900, or ETX1200, what does that mean?
I just installed my EarthX battery in my aircraft and started the engine and my charging amps was really high, is this normal?
What is the shelf life or life span of a battery?
What is the difference between PCA and CCA?
Can I hook an EarthX battery in parallel or series with a lead acid battery?
What maintenance is required?
The battery does not seem to charge or hold a charge, why?
Can the battery be installed in any position?
How do I know if my battery charger is working?
Is it safe to hook up the battery to a charger and walk away?
How often should I charge the battery?
Are lithium batteries safe?
How long should I wait in between failed start attempts?
How much do I tighten the screws for installation?
How long will my battery last?
Why does my battery look puffy or swollen?
Will my aircraft lithium battery catch fire?

Related Videos

How to Charge Your EarthX Lithium Battery

Do EarthX Lithium Batteries Explode?

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