A method for storing a battery unit, which is intended for installation in an electric vehicle, in an intermediate storage facility to compensate for network fluctuations of a supply network, comprising a plurality of battery units, each including an energy transmission interface and a signal interface, comprising an inverter and/or rectifier, a control unit, a shelving system comprising at least two shelves including a plurality of slots for a respective battery unit and a loading device, each slot comprising an energy transmission interface and a signal interface, wherein each battery unit comprises at least one rechargeable battery cell and a battery management system for monitoring and regulating the battery cell; at least two battery units in each case are electrically connected in series to form a string; comprising a plurality of strings that are connected to the inverter and/or rectifier and electrically connected in parallel to one another; the respective string is electrically connected to the supply network via the inverter and/or rectifier; and the control unit is communicatively connected to all battery management systems and designed to effectuate a charging of the battery cell and/or of the battery unit with electrical energy from the supply network, a feeding of electrical energy into the supply network by discharging the battery cell and/or the battery unit and/or a connection and/or a disconnection of the battery unit from the inverter and/or rectifier, and comprising the following steps: inserting the battery units by way of the loading device in respective slots of a shelf in such a way that, during the insertion of a battery unit by the loading device, the energy transmission interface of the battery unit is automatically connected to the energy transmission interface of the respective slot, and the signal interface of the battery unit is connected to the signal interface of the respective slot, whereby the battery units are connected to form a respective string and the signal interfaces of the battery units are connected to the control unit; charging a string selected by way of the control unit with electrical energy from the supply network and/or feeding electrical energy from the selected string into the supply network within a time period and/or up to a provision point in time so as to compensate for network fluctuations of the supply network; and replacing all battery units of each string in such a way that, upon the removal of the battery units from the slots by the loading device, the energy transmission interfaces are automatically disconnected from the respective string and the signal interfaces are disconnected from the control unit. inserting the battery units by way of the loading device in respective slots of a shelf in such a way that, during the insertion of a battery unit by the loading device, the energy transmission interface of the battery unit is automatically connected to the energy transmission interface of the respective slot, and the signal interface of the battery unit is connected to the signal interface of the respective slot, whereby the battery units are connected to form a respective string and the signal interfaces of the battery units are connected to the control unit; charging a string selected by way of the control unit with electrical energy from the supply network and/or feeding electrical energy from the selected string into the supply network within a time period and/or up to a provision point in time so as to compensate for network fluctuations of the supply network; and replacing all battery units of each string in such a way that, upon the removal of the battery units from the slots by the loading device, the energy transmission interfaces are automatically disconnected from the respective string and the signal interfaces are disconnected from the control unit.