Well, the battery box that the 120AH Kings battery comes in is fairly robust and would take a decent splash, but the lid is only held down with a couple of buckle straps and is not a particularly tight fit, so "waterproof" is probably out of the question. Having said that, you'd really need to give it a proper dunk to get the actual battery inside soaked. If I was you, I'd be tempted to get into Kings and check them out to see if they're fit for purpose - a lot easier to decide rather than trying your luck on Aliexpress. Good luck!
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