Did you shutdown the whole system all the way to the main switch after youv'e changed the batterie ? And does your main was at off when youv'e changed the batterie ? Changing the batterie while the main is off might cause data loss. I work on scm morbidelli N200 & Morbidelli universal 3615, and when the exception 24,5 occur shutting down 3/4 of time solve that problem.