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Old 04-01-2015, 01:29 PM   #1
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Silver Hawk's Avatar
1975 31' Sovereign
Palomar Mountain , California
Join Date: Feb 2013
Posts: 317
Battery question/advice

I was reading an article in a trailer magazine about batteries and toward the end the author stated in passing: "you can run AGM batteries below 50%".
I have read many articles and threads on this forum and it has always been gospel to never run batteries below 50%. Did I miss something or was this writer throwing out something that was in his head but not true.
I know a bit about wet batteries, but almost nothing about AGM's - which I bought two years ago (2x6v) and am very happy with - but it would be great to get more use out of them, and/or not get so worried when I'm running down close to 50%.
Any knowledge out there about this?
Thanks, you'all

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Old 04-01-2015, 01:49 PM   #2
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2009 30' Classic
Melbourne, FL , Searsport, ME
Join Date: Jul 2013
Posts: 308
"you can run AGM batteries below 50%"
Sure you "can", but should you? Not routinely and as infrequently as possible.

Fred Stokes
RV Rearview Camera Systems, LLC
WBCCI #2810
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Old 04-01-2015, 01:50 PM   #3
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2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,020
Much folklore and little fact

AGM or wet, in typical RV use while camping you can run them down to 80-90% DoD provided that they are recharged promptly. Yes it will reduce the cycle life but in typical RV use that isn't why batteries die. Your Airstream is not a forklift or a floor machine and the batteries are not discharged and recharged 365 times a year.

I run mine down to 80% DoD when I need to which ends up being maybe 3 or 4 times a year at the most. Flooded group 27s. Still going strong after five years.

It is the situation where the batteries discharge in storage and then remain in a discharged state for a long period of time or in freezing conditions that leads to damage.
To learn to see below the surface, you must adjust your altitude
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