Any Ideas What Would Cause Batteries To Boil. Was Looing At A Large Boat For A Friend At The Marinia And 1 Bank Of Batteries Was Hot To The Touch And Boiling. Had All Dc Items Off.

Sulphated plates will cause recharging energy to become heat instead of stored energy. Overly high charging voltage will cause boiling as well. Verify charging voltage first, if ok(not over 14.6 volts dc above idle), replace battery.