this post was submitted on 05 Sep 2023
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I was under the impression that battery packs are watertight so where is the fire starting?
They are likely IP rated in some form or fashion, that means they are rated for protection for a period of time at a certain depth. Deeper water or longer time in water means you still get water past the seals.
It could also be a control fault or short on the electrical side allowing the other components to catch fire or overloading the batteries causing them to overheat and catch fire.
Also, IP rating is not valid for salt water or any other fluids such as alcohol, only fresh water