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Earthx Etx680c Lithium Battery 12v/12.4 Ah Case C - Experimental Aircraft Only

$379.00/Each
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Part# 11-14292
MFR Model# ETX680C

Overview

Note: Not FAA Approved. Intended for use in EXPERIMENTAL AIRCRAFT ONLY.

This lithium starter battery is intended for 400ci engine size or less; 60 amp alternator/generator or less. This battery is used in experimental aircrafts. So, just match up the alternator output with the correct battery.

Additionally, a battery management system (BMS) fully protects this lithium starter battery. The BMS protects the cell’s from over discharge, over charge, short circuit, temperature, in addition to cell balancing, to ensure charge levels are equal. Additionally, our ETX-Hundred Series aircraft batteries have redundant electronic circuits and battery fault indication. The fault indicator can be connected into your EFIS or wired to a 12volt LED light on your control panel to alert you to the state of charge and state of health of the battery. (Please see manual for details)

The difference between the ETX680 and the ETX680C is the physical size, with the "C" being for more compact dimensions.
   
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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Benefits

  • With EarthX, you gain the quality and performance you want from your lithium batteries. Our experienced team commits to innovation and industry best practices to deliver batteries you can trust. We only source high-quality materials for our batteries, and we support every product with attentive customer service. The aircraft specific batteries are the ETX Hundred series, do not use the power sport batteries as they do not have all the same safety features as the aircraft specific ones.
  • As a veteran-owned, U.S.-based company, we’re proud to provide the batteries you require for your experimental aircraft.

  • Advantages Of Utilizing EarthX Batteries For Experimental Aircraft
  • EarthX lithium batteries offer many benefits for experimental aircraft, including:
  • Lightweight materials: Our lithium batteries use cutting edge technology that lead to a much lighter battery and more powerful batteries as compared to lead acid counterparts. There’s about an 80% weight savings over a comparable lead acid battery for instant weight savings.
    For Example: the PC680 weighs 15 pounds and has 170CCA. The EarthX ETX680 weighs 4 pounds and has 320CCA. Lighter weight makes installation easier and improves the handling of your aircraft.
  • Increased cranking power: EarthX Batteries do not experience the large voltage drops as lead acid batteries experience to provide you a consistent and powerful startup every time you use your aircraft.
  • Safe performance: EarthX Batteries feature a state-of-the-art Battery Management System (BMS) that monitors performance and prevents overcharging and over discharging. The BMS is key to the longevity of our batteries.
  • Long-lasting: With the help of the BMS, our lithium batteries can last up to six years, even with heavy use in your experimental aircraft.

  • Our Commitment To Powering Aviation
  • Innovation drives us, and we continue to develop our batteries for use in the aviation industry. We are the first and only company in the world to have a 12V FAA TSO approved lithium battery for aviation use, and this is only the beginning. Our engineers have more TSO approved models in the works to make a significant impact on this industry. We currently also have a 24V FAA TSO battery offering.
  • Lead acid batteries have been at the forefront of aircraft power for decades, but we want to see change. Our developments in lithium iron phosphate batteries offer greater power, performance and safety for aircraft of all types. Be prepared to see new aircraft on the market that come with EarthX Batteries straight from the manufacturer.
  • We have goals in the aviation industry to make changes for the betterment of all, and we’re offering our support wherever we can with a Veteran owned and operated company in the USA.

Specifications

  • SKU: ETX680C
  • Voltage: 13.2
  • Weight: 3.9lbs (1.8kg)
  • Cold Cranking Amps (CCA): 320
  • Peak Cranking Amps (PCA): 680
  • Amp Hour (1C Rate): 12.4
  • Chemistry: Lithium Iron Phosphate (LiFePO4)
  • Case Size: C
  • Dimensions: 5.9" L x 3.4" W x 4.5" H (150mm L x 86mm W x 115mm H)

In The Box

  • 1 x ETX680C
  • 2 x 6mm screws
  • 4 x 4″ foam
  • Accessories
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Reviews

After six years, it was time to replace the battery on my CH601 XLB. Buying a direct replacement for the old EarthX battery was a no-brainer since the old battery held up for quite some time and never caused any problems. I originally had an issue after the replacement, but it turned out that the battery wasnt the problem. EarthX provided excellent customer service, and I want to commend Logan from EarthX for providing the best experience possible.

Klaus B
May 22, 2026

Alain M Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

June 25, 2025

Got 6 years out of my first one.

Glenn G Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

February 20, 2025

First Earth-x I am impressed!

Lional R Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

December 10, 2024

Chemtrail C Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

September 25, 2024

I use the battery as a portable, no onboard charging. It seems to need charging after a single start cycle. . First couple of charge cycles the battery seemed to topout and/or settle at low voltage. Presently it settles to around 13.55v. I find it cranks far faster than an LA Gill.

Steven C Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

April 18, 2024

Installed a EarthX battery in my Challenger 2 ultralight. What a difference, weight and performance.

Steven
November 22, 2023

Were I was placing the batt. In the plane I got to thinking about safety

Sharon G Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

October 5, 2023

Worth every penny in weight savings and increased capacity compared to lead.

Jonas B Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

July 15, 2023

This is an outstanding product.

Edgar F Verified Purchase

EarthX Lithium Battery Experimental Aircraft 12V/12.4 AH Case C ETX680C

April 4, 2022

Q&A

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: Does this item ETX680C ship internationally?

Yes, we can export this item.

Q: Are the EarthX ETX680 a side post connector?

These are top post.

Q: When will this EarthX battery be available for certified aircraft?

At this time, EarthX only makes the ETX-900 in TSO version. See Part# 11-18242.

Q: The catalogue shows that 680C dimensions as 5.9Lx4.5Wx3.9H but the website has the dimensions as 5.9Lx3.4Wx4.5H. What are the actual dimensions?

Per the vendor spec sheet the dims are 6.5 L x 3.1 W x 6.6 H.

Q: Is this shipped as DG? Do you have MSDS? Thanks!

Yes, this is considered dangerous goods for shipping purposes. It is shipped under regulations for UN3480. MSDS has been added to the web page in the 'Documents' section.

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