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Re: mount battery in bilge floor?
Glue won't stick to a battery box, but that's why boxes are usually strapped down. You can generously glue down some battens, and then strap or bolt (or both) the plastic box down to them. You want whatever job you do to be strong enough, and rigid enough, so that you literally can roll the boat over without the battery shifting.
The bigger issue may come back to "what kind of battery do you have". The criteria here is "wet lead acid" or "sealed" because when salt water gets into the bilge, if it gets into a plain wet lead acid battery it will combine with the electrolyte and give off large amounts of chlorine gas. Which is very good at burning out eyes, throats, and lungs in very short order.
So personally? I wouldn't put an unsealed battery in a bilge space, at all.