Daimler and enercity put battery replacement parts store for electric vehicles on the grid - Mercedes-Benz Group Media - Efficient dual use of electric vehicle battery systems can improve the eco-balance and lower the lifecycle costs of electromobility: In October 2017, a large-scale stack of electric vehicle battery systems went into operation in Hanover as part of a cooperation partnership between Daimler AG with its wholly-owned subsidiary Mercedes-Benz Energy GmbH and enercity (Stadtwerke Hannover AG).