polished billet battery boxes with odyssey batteries 9 years old and look brand new. just put new batteries this season

Lead acid batteries emit hydrogen sulfide when charging or over charging, it will corrode any nearby metal. Good ventilation or different battery technology are about the only options.

If it's that big of an issue I'd try different batteries. Sounds like those batts are making a mess. I used some cheaper polished AL boxes last season, no clear or anything for protection on them. There's some signs of light corrosion on them but I think that's from water getting in through my side intakes (rain) in the boat and sitting on the them. I use optimas and charge them in the boat a couple times a season. I got the hardin / CP billet boxes now that I'm going to mount in a more protected spot.

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This pic was near end of season last year. If you look closely you can see the minor spots. I can prob get them out polishing by hand.

I've read mixed reviews of Optimas and decided to stay with trusty old lead-acid batteries when I replaced them last year. The original batteries lasted 10 years. I'd like to go back to a plastic box but stronger. I painted my old ones Merc Racing blue and they looked good but they keep breaking.

We made custom battery boxes for my boat and the first time I tilted it on the trailer the "un-spillable" batteries dumped all the battery acid out all over everything in the engine compartment. I just washed it all out with a garden hose and the battery boxes still look new.

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I'm surprised you don't have lithium ion batts in there. Or just designed your own.

I started working on Lithium batteries for it but just decided to go ahead and build a miniature nuclear reactor for it.

Hmm. Uranium heavy. But you could abscond the nuclear waste off of Japan and create another Godzilla, that'd be cool. But don't dump it near Russia, you'd create another Putin.

BigSilverCat, those are cool.

Does anyone make a heavy duty non-metallic box? Something with 4 hold-down nuts should work. I'm also not real comfortable with the anodized aluminum tops being so close to the terminals. Of course there will be some current flow across the top of a lead acid battery.