From $379.00 to $899.00
Model Volts 1 Hr 1C Rate Crank Amps
Weight Case Size
L x W X H (In.)
PN Price Buy
ETX68013.212.4680/3204.1 lb6.5 x 3.1 x 6.6
ETX680C13.212.4680/3203.9 lb5.9 x 3.4 x 4.5
ETX90013.216840/4004.9 lb6.5 x 3.1 x 6.6
ETX900-2426.415.6840/4008.9 lb6.5 x 5.1 x 6.6
ETX900-VNT13.216840/4005.4 lb6.5 x 3.1 x 6.6
ETX120013.224.81200/6006.9 lb6.5 x 3.1 x 6.6
Subtotal $0.00
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Note: Not FAA Approved. Intended for use in experimental aircraft only.

When quality, performance, and safety matter, EarthX is the most trusted and used brand by experimental aircraft manufacturers and experimental aircraft owners, and endorsed by engine companies such as Rotax, Continental, ULS Power and Viking. Remove weight and increase power, all with one product!

These ETX Hundred series (ETX680C, ETX680, ETX900 and the ETX1200) batteries are recommended for your primary engine aircraft battery. These models are equipped with redundant electronic circuits on the BMS board and have an LED battery fault light indicator to alert you to cell health and state of charge. The battery management features include over discharge protection, over charge protection, short circuit protection up 1000 amps, excessive cranking protection (temperature sensing) in addition to integrated cell balancing technology.

With an EarthX lithium battery, you will gain a significant amount of cranking amps and drop a minimum of 11+ pounds instantly by switching from a lead acid battery.

Please view the Aircraft Application Flowchart under the documents tab for assistance in selecting the correct EarthX battery for your application.

Additional Specs
ETX680C UNIVERSAL 60 or less
ETX680 UNIVERSAL 60 or less
ETX900 UNIVERSAL 80 or less
ETX1200 UNIVERSAL 120 or less


  • The ETX Hundred series is fully protected by an integrated Battery Management System that protects the cell’s from over discharge, over charge, short circuit, thermal protection and built in cell balancing to ensure charge levels are equal (balanced) 100% of the time for optimal performance
  • and life.
  • The most trusted and used lithium battery on the market. Multiple experimental aircraft manufacturers and experimental engine manufacturers such as Rotax Engines, Continental Motors, UL Power Engines and Viking Engines approve the EarthX brand.
  • LiFePO4 chemistry, the most abuse tolerant of all lithium battery chemistries.
  • Higher voltage while cranking mean faster starts.
  • Extremely light weight, 70-80% lighter than your lead acid battery.
  • 4,000 charge cycle life versus 350 charge cycle life of a lead acid battery. Can last up to 8 years.
  • Environmentally friendly, no hazardous lead or acid, will not corrode or sulfate.
  • Wider operational temperature range than a lead acid battery. (-22° F to 140° F, -30 ° C to 60° C) . A lead acid’s operational range is(-40° F to 113° F or -40° C to 45° C).
  • Vibration tested to DD-311 FAA standard.
  • Low self discharge rate and fast charging.

Why Choose EarthX

  • You will instantly remove 11+ pounds compared to the lead acid battery in your experimental aircraft! Now that is a huge weight savings.
  • Significant increase in cranking power. If you have been using the PC680, you will increase your CCA’s from 170 to 320 and the PCA’s from 520 to 680! Now that’s power to crank your engine!
  • Now you can easily have a backup battery and not worry about the additional weight. In fact, if you switch from a lead acid battery and add a backup battery, so you have a primary and a backup, you still have decreased your overall weight by 50%! Note that only the ETX680C/680/900/1200 have the aircraft specific BMS.
  • Innovative and sophisticated BMS designed and engineered with redundancy for safety, reliability, and performance. These are EXCLUSIVE features!
  • Customers Also Viewed
  • Frequently Purchased With



Mary S Verified Purchase


November 2, 2021

At least 50% more RPM on starting I can sure you the BMS system saved the battery as I mistakenly left my master switch on for a day and after recharging the battery all is well

Keith S Verified Purchase


July 21, 2021

Wild power, low weight. Nothing we have used compares

Decosse C Verified Purchase


June 25, 2021

Very light well constructed , comes with terminal bolts.

April 10, 2020


January 13, 2020

Replaced two Odyssey PC680 batteries that were unable to turn over my new engine in parallel. The EarthX Batteries didnt just turn it over, they spun the prop and it started on the second try. Saved 26 lbs in the process. Very happy with them.

Robert A
February 7, 2019

Very light battery. I pulled out an Odyssey PC 925 and put in a EarthX ETX680C battery. Weight savings about 22 pounds. It came with easy instructions to run a LED warning light to the dash. It also included some small foam pieces for mounting. The biggest surprise was starting the motor. The EarthX arrived at its lowest charge of 13.2 volts. I did not bother to charge it up to full capacity, I just put it in and started the engine and it cranked over faster than the Odyssey battery did when it was full charged!

Robin M
December 10, 2018

Works well saved 19 pounds off planes weight.

December 23, 2017

The above chart lists the battery case as measuring 6.5 x 3.1 x 6.6 - which is smaller than the published Odyssey PC680 dimensions. However the EarthX Battery did not fit the Vans Firewall Forward battery case designed for the Odyssey PC680. It was too thick.

Rv-14a B
November 26, 2017

I was disappointed that c customer service agent could not have much knowledge about the battery when I try to order it for my particular aircraft everything worked out okay

Ronald B
August 6, 2020


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: Are any of these approved for certificated aircraft?

The Earth X Lithium Batteries are not TSO'd and are not designed for certified aircraft.

Q: Can the Earth X Lithium batteries be mounted in any direction and do they have any limitations as far as aerobatics?

Per the supplier: These batteries do not have any limitations. You are able to mount these in any direction you would like including upside down.

Q: Since Earth X batteries have the on-board computer, can they be charged with any run-of-the-mill battery charger?

Per vendor, these batteries can be charged with any charger other than a desulfating charger.

Q: Which Earth X battery is recommended for a Rotax 912 without the external alternator?

Per Earth X: We recommend either the ETX680 or the ETX900 for the Rotax 912 without external alternator. The ETX 900 is the upgraded version of the 680 but both would work.

Q: I need 28V, can I connect two of these Earth X batteries in series to obtain 28V?

Yes, you can connect up to two batteries in series, however they would only be 24 volts, not 28 volts, as each battery is 12 volts.

Q: What doe the C stand for in ETX680C. In other words, other than case size and weight, what is the difference between ETX680 and ETX680C?

We believe the "C" stands for Compact. The ETX680C is a smaller battery than the ETX680, but has the same voltage and cranking amps. The case dimensions are listed on the web page.

Q: Can two Earth X batteries be connected parallel to increasing capacity?

Per Earth X: Yes, you can connect two Earth X batteries in parallel.

Q: Can I add a EarthX Lithium battery in parallel to a lead acid battery?

No. The voltages are not the same and you will over charge the lead acid battery and drain the lithium.

Q: What EarthX battery is recommended to start a Lycoming IO-360?

ETX680 for normal climate or the ETX900 if they are in a colder climate or just want extra cold cranking amps.

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