Looks like it will be an official recall.
http://www-odi.nhtsa.dot.gov/owners/SearchResults.action?searchType=PROD&prodType=V&targetCategory=A&activeTab=0&searchCriteria.model_yr=2015&searchCriteria.make=MERCEDES%20BENZ&searchCriteria.model=B-CLASS%20ELECTRIC&searchCriteria.prod_ids=1991027
http://www-odi.nhtsa.dot.gov/owners/SearchResults.action?searchType=PROD&prodType=V&targetCategory=A&activeTab=0&searchCriteria.model_yr=2015&searchCriteria.make=MERCEDES%20BENZ&searchCriteria.model=B-CLASS%20ELECTRIC&searchCriteria.prod_ids=1991027