Yeah ?!?!? I've got coastal batteries ! I don't trust them , don't like them . That's what came with the boat . If I had the prescence of mind I would have gotten a different kind , would have cost more money though I'm sure . Coastal batteries look like they would be a recycled battery , like Excide batteries .
Did you ever service them ? How long have you had them ? How many amps is your charger ?
Make sure you get in there and clean all that acid up soon , spray it all down with a good anti-corrosion stuff .