Quote:
We suspect the boat has an underlying electrical issue but both the dealer and manufacturer claim it is not so.
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With what is known here, I agree with dealer and manufacturer.
Was the switch off? If so, this eliminates everything related to the boat, except maybe the auto bilge that might be wired to one battery or the other. If it is fused as it should, a shorted pump would blow fuse, problem diverted. Stuck on, pump runs till battery dead. Would come right back on as soon as battery voltage is restored.
Loose connections, low water, over charging, freezing, spark while charging, internal short can all cause a battery to "explode".