BIG FISH 2006 wrote:
one is 3 years old and one is less than a year, I left them in the boat
with the onboard charger hooked up all winter, one battery for some
reason exploded, I think maybe it was low on water.

matthew 4:19
follow me and I will make you fishers of men.



Sounds like you might have a charger problem, that is cooking your
batteries, instead of shutting off, and maintaining them

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