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Posted: Fri Dec 19, 2014 1:20pm

Post Subject: Battery Terminal Gunge

One of the positive terminals on my identical paralleled 135Ah leisure batteries keeps producing colourful galvanitic gunge and corrodes away the clamp. This happens regardless of its position in the pair. In all other respects the battery seems fine. Does the material of the clamp matter and should they be paired? Cheers


Posted: Fri Dec 19, 2014 4:39pm

Post Subject: Battery Terminal Gunge

It almost certainly means that the seal between the battery top and the post is leaking. This is usually the result of over enthusiastic application of a spanner without taking steps to stop the clamp and post being twisted over. There is nothing you can do to stop such leaks unless you have overfilled the cells. However if you remove the clamp, clean it up and then smear lots of Vaseline around the post. Refit and tighten the clamp (holding it with grips to stop the spanner twisting it to one side) and then smear the surplus Vaseline plus a bit more of required all over the outside of the clamp you may well find the problem is significantly reduced.

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