McFarlane Aviation Products - ETX900-TSO-25-KIT BUNDLE

Part Number: ETX900-TSO-25-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
25Ah Battery Box Insert
ML Spec Amber 12V LED
Fault Light Indicator Placard
Tubing (3/8")
Grommet (3/8")
Grommet (1/4")
Wye Tube Fitting (3/8")
90 Degree Tube Fitting (3/8") 
90 Degree SS Elbows (1/4")
Tubing (1/4")
Spring Clamp
Quick Reference Guide

STC Paperwork included with installation kit!


Used for replacing a Concord or Gill 25Ah 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 Comment Eligibility Chart
Cessna 120 120 8003 15075 7853
Cessna 140 140 8001 15075 7853
Cessna 150 150 17001 59018 7853
Cessna 150 150A 15059019 15059350 7853
Cessna 150 150B 15059351 15059700 7853
Cessna 150 150C 15059701 15060087 7853
Cessna 172 P172D P17257120 P17257188 7853
Cessna 175 175 55001 56238 7853
Cessna 175 175A 56239 56777 7853
Cessna 175 175B 17556778 17557002 7853
Cessna 175 175C 17557003 17557119 7853
Piper PA-12 PA-12 12-1 12-9999 7853
Piper PA-12 PA-12S 12-1 12-9999 7853
Piper PA-18 PA-18 18-1 18-7632 With 25Ah battery box. 7853
Piper PA-18 PA-18A 18-1 18-7632 With 25Ah battery box. 7853
Piper PA-18 PA-18S 18-1 18-7632 With 25Ah battery box. 7853
Piper PA-20 PA-20 20-1 20-99999 With 25Ah battery box. 7853
Piper PA-20 PA-20S 20-1 20-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22 22-1 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22-108 22-8000 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22-135 22-534 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22-150 22-2378 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22-160 22-2378 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22S-150 22-2378 22-99999 With 25Ah battery box. 7853
Piper PA-22 PA-22S-160 22-2378 22-99999 With 25Ah battery box. 7853
Piper PA-24 PA-24 24-1 24-3687 With 25Ah battery box. 7853
Piper PA-24 PA-24-250 24-1 24-3687 With 25Ah battery box. 7853
Piper PA-24 PA-24-260 24-3642 24-5034 With 25Ah battery box. 7853
Piper PA-24 PA-24-400 26-1 26-148 With 25Ah battery box. 7853

Related Documents

Supplemental Type Certificates

EarthX STC for SA01005DE

Safety Data Sheets (SDS)

EarthX SDS

Maintenance and Product Guides

EarthX LED Indicator Quick Reference
EarthX Maintenance Manual ETX900-TSO
EarthX Production Spec ETX900-TSO
EarthX Top Assembly ETX900-TSO

Eligibility Charts

Eligibility for EarthX

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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Please verify product details for suitability for your application.

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