Have an authorized dealer check out the motor for you. If it is the EMM, then ask the tech to contact Evinrude Dealer Support to see if they would assist in helping you with the cost or replacement.
Do you have wing nuts or perhaps loose or corroded connections on the battery terminals?
Has your motor had an overheating issue sometime in the past?
Either one of those happenings can greatly shorten the life of an EMM.