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Old 06-07-2016, 17:59   #1
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Storage temperature of AGM's

What is the long term effect of leaving an AGM battery exposed to high temperature while stored?.....
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Old 07-07-2016, 07:03   #2
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Re: Storage temperature of AGM's

No one biting? I'll make it a bit easier to understand why I'm asking..

I have one AGM battery which has been stored under the cockpit seats for about 3 sunny month, exposed to tropical sunlight. I'm guessing the temperature reaches around 110 -120 degree F during daytime...

The battery is not connected to anything so is neither discharged or charged.
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Old 07-07-2016, 07:18   #3
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Re: Storage temperature of AGM's

Was the battery fulled charge before storage? If so, it should be OK but is possibly down to about 50% SOC or less.
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Old 07-07-2016, 15:55   #4
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Re: Storage temperature of AGM's

I doubt it was fully charged. It came from another storage place and was placed in the cabinet by some maintenance guy who forgot about it..and I don't want it if its damaged...
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Old 07-07-2016, 16:31   #5
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Re: Storage temperature of AGM's

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I doubt it was fully charged. It came from another storage place and was placed in the cabinet by some maintenance guy who forgot about it..and I don't want it if its damaged...
In which case, I'd assume that it is deeply discharged, sulphated and does not have long to live. At those temperatures, the self-discharge rate would be a lot higher than normal and the battery has probably sat for a long time at a low SOC and built up a lot of sulphate.
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Old 17-09-2016, 05:29   #6
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Re: Storage temperature of AGM's

Hi all

I am in the throws of a learning (read expensive) expereince on AGM batteries. I live in Dubai and have had to replace all 4 of the Victron 165aH AGM's after just 3 yrs!

I found this on their website:-
https://www.victronenergy.com/upload...tteries-EN.pdf

Temp seems to have a huge affect on battery life!! I am looking at ducting some of the AC air into the battery compartment.

Anybody have any ideas on a better solution?
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Old 17-09-2016, 10:26   #7
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Re: Storage temperature of AGM's

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Originally Posted by avi8tor_dxb View Post
Hi all

I am in the throws of a learning (read expensive) expereince on AGM batteries. I live in Dubai and have had to replace all 4 of the Victron 165aH AGM's after just 3 yrs!

I found this on their website:-
https://www.victronenergy.com/upload...tteries-EN.pdf

Temp seems to have a huge affect on battery life!! I am looking at ducting some of the AC air into the battery compartment.

Anybody have any ideas on a better solution?
That's a pretty brutal chart from Victron. Says at 40c/104f you only get 2 years out of the battery.
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Old 17-09-2016, 14:26   #8
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Storage temperature of AGM's

I have ducted a small amount of AC air to my bank, it keeps them about 70 F. Used a piece of cheap bilge pump hose, the cheap flexible type.
Of course make sure your charging source has a temp probe on your bank, this gets more important the hotter the bank gets.

In hot weather, the cooler you can keep them, the better.


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