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I expect there is a simple answer to this. Why do I get a build up of offf white powder on my negative battery terminal? It is on the negative crocodile clip of my battery charger, and the negative lift off battery clamp in my Caravan. Can someone explain to me what causes it, and is there a cure?

Tim.

Thanks for the replies. Yes I am using the quick release terminals too. Much easier than a spanner. I will try the Vaseline and see if this helps.

Tim,

The white powder is a result of the chemical reaction when your battery is charging, the powder mainly consists of hydrogen sulphide.

The only way to get rid of it is to pour boiling water over the terminal and the clamp, when all of the powder residue has gone and the terminal & clamp are dry clean them up with a scouring pad, until bright and shiney thus ensuing a good electrical contact, put the clamp back onto the terminal and only then cover them with a light coat of petroleum jelly (vasaline to you) DO NOT under any circumstances use grease.

The purpose of the vasaline is to exclude air, which is needed for the powder to form, the composition of grease attacks and eats away the lead in the terminal post.

Hi Tim

I agree with George B except that you smear the post with vaseline before clamping the terminal on. This ensures no air gap betwen the clamp and the terminal post.

Tyreman

Thank you all for your replies. I will clean the terminals and coat with Vaseline at the weekend.

Tim,

Yes i'm afraid that it does include copper slip and it's derivatives, its not the copper thats at fault but the grease carrier

Quote: Originally posted by Tim Denny on 13/8/2007

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Thanks for the replies. Yes I am using the quick release terminals too. Much easier than a spanner. I will try the Vaseline and see if this helps.

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