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Foolish

Trying to understand battery corrosion

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I use two 6V golf cart batteries, connected in series to produce 12V, on my boat. One of the negative terminals has very bad corrosion. But only one terminal, not the other negative terminal and not the positive terminals. I would like to figure out why?

 

My system is closed. I have no inboard motor to ground to, and I have no other external metal on the boat at all, so I don't have any grounding other than the batteries themselves. It's an Olson 30.

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Vented, with normal caps on top. The water levels are fine.

And the system is powered by 35 W of solar panels with a controller.

My normal power usage is very low, with just a couple of instruments running, but I also have an autopilot that takes substantial power.

I don't know if these have an impact on the corrosion problem, but I thought they are worth mentioning.

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You could have gas escaping between the post and the case. Take the cable off and give it a looksee. Not much you can do if that's the case but it's not necessarily a big problem. Clean up the corrosion, expose fresh metal on the terminal and cable, connect it back up, and hose it down with some anti-corrosion treatment.

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TOP TIP

 

If it is the usual pile of green gunge pour boiling water over it. It will not harm the battery.

 

Then smear with vaseline.

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