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Old 08-09-2013, 02:01 PM   #1
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Battery Shelf Life

Looking at getting a group 31 AGM battery. The local Sam's Club had two with a manufacture date of Dec 2012. I asked if they ever put chargers on the batteries and the response was "No they come charged from the factory".

How long is too long to sit on the shelf with no trickle charge before it is not wise to buy it.
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Old 08-09-2013, 02:59 PM   #2
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AGM's have a relatively low self-discharge of 1% to 3% per month.

So, a December 2012 battery would be about 8 months old and have discharged 8% - 24%. But, I believe the rate will be higher unless it was a cool storage room. You should consult the manufacture owners manual or err on the side of caution.

Are they willing to test it for you or sell it to you and allow you to test it (30 day guarantee)?

Speaking of, batteries are guaranteed from the manufacturer. I believe that guarantee starts on the build date of the battery and not your buy date. Just something to check into now that you are 3/4 of a year into it.

My personal preference is not to buy a battery more than 3 months old, but I buy flooded and they self-discharge faster than AGM.
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Old 08-10-2013, 10:56 AM   #3
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Thanks for the info.
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Old 08-10-2013, 11:54 AM   #4
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Quote:
Originally Posted by cpd1343 View Post
Thanks for the info.
I'd take a multimeter (digital) and see what the resting voltage is on the battery. If it's much below 12.8v, or 12.6v.
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