NOVELTY - The method involves ascertaining (106) whether a suitable opportunity exists for an electrical regeneration on an upcoming travel route based on information concerning the upcoming travel route. A first energy loss which occurs during the electrical regeneration, is determined (112). A second energy loss, which results on previously determined and defined routes due to aging effects of an energy store, is determined (128). The first energy loss is compared (130) with the second energy loss. The regeneration process is executed (132) when the second energy loss is greater than the first loss.    USE - Method for electrically regenerating an electrical energy store i.e. lead battery, in a motor vehicle.    ADVANTAGE - The first energy loss is compared with the second energy loss, and the regeneration process is executed only when the second energy loss is greater than the first energy loss, thus allowing an optimization of the electrical regeneration of the energy store, avoiding switching off the internal combustion engine of the motor vehicle by a start-stop device during a stop, and allowing anticipatory planning and carrying out of refresh cycles with little limitation of energy-optimized operating strategies of the vehicle.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a computer program with instructions for executing a method for electrically regenerating an electrical energy store in a motor vehicle    (2) a data carrier with instructions for executing a method for electrically regenerating an electrical energy store in a motor vehicle    (3) a control unit for controlling an electrical regeneration of an electrical energy store.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating the process for electrically regenerating an electrical energy store in a motor vehicle.    Step of ascertaining whether a suitable opportunity exists for electrical regeneration (106)    Step of determining a first energy loss (112)    Step of determining a second energy loss (128)    Step of comparing first energy loss with second energy loss (130)    Step of executing regeneration process when second energy loss is greater than the first energy loss (132)