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Don't use petroleum jelly. It's a bad habit. Silicone grease is is what should be used as it doesn't deteriorate EPDM rubber components. Internet cheapskates substituted petroleum jelly because it's also a clear grease but color isn't the only part of the story.

Yes, they're called stainless steel bolts. The terminals are lead, the lugs are copper, the bolts are stainless. You can't avoid a dissimilar metal combination. They key is to keep everything dry. If your battery starts blooming that blue stuff, it's time to replace the battery, it's leaking.

If you're going to use dielectric grease on battery terminals it's best to coat the assembled connection with it. Galvanic corrosion doesn't simply occur due to contact by dissimilar metals, it requires an electrolyte to be present (salt water). If you can keep the galvanic couple dry you won't...