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Seeking Battery Box for Group Size BTX20L Battery

 
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Ceengland



Joined: 11 Oct 2020
Posts: 393
Location: MS
PostPosted: Wed Nov 30, 2022 5:10 pm    Post subject: Seeking Battery Box for Group Size BTX20L Battery Reply with quote
On 11/30/2022 5:26 PM, Art Zemon wrote:

Quote:
Folks,



I decided to try a cheap AGM battery in my airplane and it is working great. So well that I want to swap out the large battery box for one that is smaller and fits more nicely. But my battery (Super Start Power Sport Battery) is slightly larger than the EarthX batteries so their boxes won't fit.


Battery Dimensions: 6 1/8 (h) x 3 1/2 (w) x 7 (l)
Group Size BTX20L



Any thoughts on places to shop?


    -- Art Z.


Hi Art,
I'd start in my scrap aluminum bin. Wink Here's what I did for a firewall mount on my RV7 project. There's a 3/4x3/4x1/8 angle running under the bottom of the tray. The other pic shows my previous RV4's battery installation. Since its firewall has a 'step', I simply set the battery on the conveniently provided shelf and used a long stainless hose clamp to hold it down. Note that the -4 spent quite a bit of time in, shall we say, unusual attitudes. Because these batteries only vent when horribly abused, if yours is inside the fuselage all that should be required is at most something around the base to keep it from shifting sideways (can be short sections of light weight angle) and a strap over the top to hold it down.

BTW, I'm sure that's a great battery, but I've been running the cheapest no-name AGMs I can find on Amazon or ebay for over 20 years. Prices have varied quite a bit depending on the price of lead, but I think the most I've paid is around $60. More typical is ~$40 for a 20-22AH battery. Some extra effort in reading spec sheets is required, but most in the 20AH range will start a Lyc without any issues. I've only had one early failure; I discovered a pinhole in one that was mounted in the -4 when it quit working after about 6 months. I'm certain it was already damaged when I installed it (likely shipping damage) and it took it 6 months to die. I typically get 4-5 years out of them unless I abuse them somehow, like forgetting the master after flying. I've recommended this technique to others as well, and no one's complained yet.

Hope that's useful info,

Charlie
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