The Cessna 120-140 Association Forum

Cessna 120, 140, and others now on the AML for EarthX STC. $$$ but saves 18 lbs over Concorde RG25XC. On my Christmas List

https://earthxbatteries.com/product/etx900-tso/

Another option 15# needs a 337 but only $240.
Odyssey
https://www.aircraftspruce.com/catalog/ ... eydry7.php

On my second one in the 120. First one lasted 10 years.

tonycondon wrote: ↑Mon Jul 24, 2023 6:25 pm Cessna 120, 140, and others now on the AML for EarthX STC. $$$ but saves 18 lbs over Concorde RG25XC. On my Christmas List

https://earthxbatteries.com/product/etx900-tso/

That's great! Though in my first model year 120, I'm keeping all the lead behind the cg I can!

I'm sure all the 140A folks know this, but according to the STC approved model list, the 140A is not included.

https://earthxbatteries.com/wp-content/ ... signed.pdf

Also, the number of the last page of the above document is interesting!

Steve A H

8424 wrote: ↑Tue Oct 03, 2023 5:51 am I'm sure all the 140A folks know this, but according to the STC approved model list, the 140A is not included.

https://earthxbatteries.com/wp-content/ ... signed.pdf

Also, the number of the last page of the above document is interesting!

Steve A H

Yes, I noticed that too Steve.

Big Pro...weight savings.

Potential Con...lithium type batteries tend to suffer shortened lives when left fully charged all the time. I reduce my RC plane lipos to a storage charge of approximately 3.85V/cell when not in use to maximize their life. I-phones have a setting for optimized charging where the phone waits to charge above 80% until it thinks you will need it also to maximize long term battery life. If I was to put an Earth-X battery in my plane I would want to try to figure out a way to drop it to a storage charge in between flights and then fully charge it prior to flying because at $700+ for the battery I would want the most life possible out of it. With that said...if these batteries prove a 10yr or so life in the field, my worries above would not really matter. The long life would more than offset the cost especially considering the weight savings.
Josh

I would highly recommend removing your battery box and installing an odyssey with its box. This will save you about 10 pounds over a concord and the factory box, and cost less than $300. For $700 that battery better fly my plane for me. Is another 8 pounds worth another $400? I guess for some. If you were moving it to the firewall that would be a huge motivator but back in the tail - I’ll pass.