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Corrosion on metal battery holder?

qwertyjjj's Avatar

Join Date: Jun 2014
Posts: 1,156

06-19-17, 05:43 PM   #1  
Corrosion on metal battery holder?

I'm getting corrosion on a weird part of the battery not connected to any terminals. Any ideas what is causing this?

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Gunguy45's Avatar
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Join Date: Dec 2007
Posts: 20,665

06-19-17, 06:26 PM   #2  
Corrosive gasses from the battery while it is being charged? And there may also be a very tiny difference in potential that is also helping cause it.

My flat stamped steel hold down has been dong that since it was probably 5 yrs old. I clean it, wire brush it, sand it, acid dip it, neutralize it, paint it with regular paint, bedliner, flexible trim paint, plastidip, whatever. It still comes back eventually. Most times I just pour some cola on to clean it up a bit then rinse with water and forget about it til next time I have the hood up. I've got a rigid piece of plastic I'm going to try to modify next time and just replace the metal piece completely.

Don't know whether sealed batteries have the same issue...probably not.

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cheese's Avatar
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06-19-17, 06:49 PM   #3  
Battery acid coming from the caps and seeping across the top is contacting the metal bar and causing the corrosion. Overfull batteries or overcharging can contribute to this. I see traces of the wetness on top of the battery between the caps. Sealed batteries don't do it as much.

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