Mobile energy store and method for operating a mobile energy store

A mobile energy store for outputting electrical energy. The mobile energy store has, in particular, a storage unit which may have a modular structure and may comprise storage modules, wherein the mobile energy store also has a number of rechargeable battery interfaces for outputting the electrical energy to rechargeable batteries and/or electrical devices comprising rechargeable batteries. A method for operating a mobile energy store, wherein the storage unit of the mobile energy store can be charged with electrical energy and the electrical energy is output from the storage unit to rechargeable batteries and/or electrical devices including rechargeable batteries with at least one rechargeable battery interface.