A long-range optical device with at least one replaceable electrical energy storage device for supplying power to the long-range optical device, which energy storage device is disposed in a closable compartment of the device incorporating electrical contacts, wherein an adapter is provided which can be inserted in the compartment instead of the energy storage device, which is configured to run a data exchange with at least one other component, in particular a memory, of the long-range optical device. The long-range optical device can optionally be supplied with power by the adapter.