The invention relates to a smart energy store for mobile consumers. The area of application of the invention is electrically driven vehicles, for example bicycles with an auxiliary electric drive. The invention is based on the object of improving an energy store, which is designed to be removable, for mobile consumers in relation to operability and efficiency. The object is achieved by means of an energy store which has a cell unit with connected battery management system, an indicator device connected to the battery management system, contact means, connected to the battery management system, for connecting to contact means of the mobile consumer at least in the form of high-power contacts and an input device connected to the battery management system. (FIG. 1)