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  #11  
Old 08-04-2014, 07:22 PM
sailvi767 sailvi767 is offline
 
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That would be my biggest concern with putting a lithium battery on the firewall. I think you insure that any engine fire be it fuel, oil or electrical in nature becomes unsurvivable.

George
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  #12  
Old 08-04-2014, 07:35 PM
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CharlieWaffles CharlieWaffles is offline
 
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Same topic/conversation posted over on Matronics, so here is what I responded there.

A couple of things come to mind as I am working through this same issue.

The EarthX 36 is LOWER reserve/usable capacity than the PC925. They do not recommend this as a swap for the 925.

I currently have an EarthX 48E sitting on my bench waiting for install. However, my plane is to install it in the tail in the original battery mount. My intent is to remove the dead weight that I can't manage and the impact on CG. I already fly with a 25lb bag of shot when flying solo, so I can easily bump that up to accomodate the 20lb loss. But when I am flying with a full bird, it then becomes weight I can move and affect CG and loading much better. I've already had issues where the plane was loaded to the point that I was close to dropping the tail, so the ability to move that big of a weight moment is very helpful.

EarthX also estimates their batteries to be about an 8 year lifetime, so considerably longer than the Odyssey PC925. So on a yearly basis the numbers should work out to be about the same.
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  #13  
Old 08-04-2014, 07:40 PM
cubdriver cubdriver is offline
 
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Default Battery

I think these batteries are great and have used one for about 2 years on the firewall with no issues. If I had to do it over again, I would install on the cabin side of the firewall to get it away from heat as Carbon Cub does on all their installations.
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  #14  
Old 08-04-2014, 07:50 PM
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Mike S Mike S is offline
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Quote:
Originally Posted by cubdriver View Post
If I had to do it over again, I would install on the cabin side of the firewall ---------
Google lithium battery fires, you may not want it at your feet.

https://www.youtube.com/watch?v=HCGtRgBUHX8
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  #15  
Old 08-04-2014, 08:32 PM
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humptybump humptybump is offline
 
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Hi Mike, the topic of "fire" comes up every time a new thread on "lithium" batteries starts.

If you've not followed those discussions here on VAF you might find it interesting reading.

The lithium chemistry in that video is significantly different from LiFePO4.
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  #16  
Old 08-04-2014, 09:48 PM
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CharlieWaffles CharlieWaffles is offline
 
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Exactly, the chemistry and composition of LiFePo4 batteries is very different for the exact reason of the instability found with just Lithium Ion batteries.

http://en.m.wikipedia.org/wiki/Lithi...sphate_battery
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Last edited by CharlieWaffles : 08-04-2014 at 09:52 PM.
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  #17  
Old 08-04-2014, 10:05 PM
sailvi767 sailvi767 is offline
 
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I am concerned about how the battery would react to a external fire source. From what I can tell the result would be bad.

George
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  #18  
Old 08-04-2014, 10:36 PM
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Mike S Mike S is offline
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Quote:
Originally Posted by humptybump View Post
Hi Mike, the topic of "fire" comes up every time a new thread on "lithium" batteries starts.

If you've not followed those discussions here on VAF you might find it interesting reading.

The lithium chemistry in that video is significantly different from LiFePO4.
I have followed them, and I am aware that the newer chemistry batteries are much less prone to fire-------but they are not exempt.

From http://en.wikipedia.org/wiki/Lithium

"Like all alkali metals, lithium is highly reactive and flammable."

Not trying to start a scare campaign here, just want folks to be informed.

I would like to see the MSDS for one of these batteries.
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Flying as of 12/4/2010

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  #19  
Old 08-05-2014, 12:52 AM
jc11378 jc11378 is offline
 
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Default Any Lithium battery

Lithium batterys are considered Hazardous materials as per the MSD sheets. For aviation there extremely hazardous. When one is part of a fire in a fire or what ever, they produce a very toxic vapor. Not a good thing on in or near a airplane.

When i was in the air force. As a crew member on the C-5, at any time we had lithium batterys on the plane as cargo. we were not allowed to take any passengers on that that leg if the trip. It was not even able to be waver-able either. So no Lithium batteries in my plane.

There very reactive and extremely toxic gasses, if involved in a fire. So I consider them unsafe for General Aviation.
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  #20  
Old 08-05-2014, 06:23 AM
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Seal the firewall well, and make a thin stainless battery box to enclose the battery. Problem solved.
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