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Old 02-15-2009, 08:25 AM
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Default [EVDL] AGM Repair

I have burnt a small hole in the side of a Deka 9A31 AGM battery.
Before I realized the hole was there I continued to drive my EV until
the suspect battery started to exhibit excessive sag. I have replaced
the battery and now I would like to try to repair the damaged one. I am
guessing that I could put some distilled water into the hole and seal it
up with epoxy putty. My question is how much distilled water? I.e. a
few drops, a teaspoon, a cup, more?

Rich

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  #2  
Old 02-15-2009, 09:28 AM
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Default Re: [EVDL] AGM Repair

Rich,

Hard to say. The amount that has gone from it.
The glass mat should be just wettish/damp
throughout, no free water in the cell...
If you put a little too much water back then
do not try to pour it out as it has become acid.
During charging the cell may vent a little and
the excess water may be removed.
Note that every AGM has the capability to vent,
usually it is implemented as rubber caps over
round piped on the top of the battery, under
a permanently sealed cover. The caps can be
lifted by excessive pressure to prevent
disaster in overcharging and overpressure cases.


Cor van de Water
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-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On
Behalf Of Rich Long
Sent: Sunday, February 15, 2009 8:46 PM
To: Electric Vehicle Discussion List
Subject: [EVDL] AGM Repair

I have burnt a small hole in the side of a Deka 9A31 AGM battery.
Before I realized the hole was there I continued to drive my EV until
the suspect battery started to exhibit excessive sag. I have replaced
the battery and now I would like to try to repair the damaged one. I am
guessing that I could put some distilled water into the hole and seal it
up with epoxy putty. My question is how much distilled water? I.e. a
few drops, a teaspoon, a cup, more?

Rich

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  #3  
Old 02-16-2009, 10:47 AM
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Default Re: [EVDL] AGM Repair

[quote]On 15 Feb 2009 at 10:16, Rich Long wrote:

> I have burnt a small hole in the side of a Deka 9A31 AGM battery.
> Before I realized the hole was there I continued to drive my EV until
> the suspect battery started to exhibit excessive sag. I have replaced
> the battery and now I would like to try to repair the damaged one. I am
> guessing that I could put some distilled water into the hole and seal it
> up with epoxy putty. My question is how much distilled water? I.e. a
> few drops, a teaspoon, a cup, more?
>

In theory, with an AGM, you shouldn't have lost any electrolyte. The way to
tell is to weigh the battery and compare it with the others. If it turns
out that you >have< lost electroltye, replacing it with water probably
won't help.

As for the burn itself, you need to make a leakproof patch as from what I
understand the AGM recombination reaction needs some internal pressure to
work right. I'm not so sure epoxy will adhere well enough. Plastic welding
might work.

If it were mine, I'd probably recycle it.

David Roden - Akron, Ohio, USA
EVDL Administrator

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