Yeah it was on a "Dual Pro" onboard charger, which is now in the trash as it's suspect. I say suspect, because I'm pretty good about checking levels, use the boat frequently and leave the compartment open for venting when the on board is plugged in after I stow it after a trip. Not only that only a few months back, I'd cleaned and inspected all the battery connections.
I didn't take a picture, but it looked very much like yours, the top 1/3 of the battery case was missing. I'm just thankful the lid was open, I can only image what might have happened if it were closed.
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