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You can fairly easily make a battery box out of 1/2" exterior or marine grade plywood, or have one fabbed up from 1/4 plexi. Easy enough to bolt down. Use a plexi top, bedded in silicone seal, so you can eyeball the battery and notch the top or side to carry out your cables and vent hose as needed.
Plexi is acid-proof, wood obviously benefits from a couple of coats of epoxy paint, and some baking soda on a felt bottom liner is good for holding and neutralizing small acid spills.
Plastic battery boxes that really are made for runabouts and pickup trucks, are just a wrong way to go on a boat.