Abstract: Energy storage device, in particular for the starter of an internal combustion engine, includes at least one energy storage element, a data generating unit for acquiring operating parameters of the energy storage device and generating corresponding data, at least one separating device for reversibly separating an electrically conductive connection between the energy storage element and a power source and/or an electrically conductive connection between the energy storage element and a power receiver, and a data transmitting unit for transmitting data between the data generating unit and a data input/output device and between the data input/output device and the separating device, where the separating device is actuated depending on data which is transmitted from the data generating unit and/or the data transmitting unit to the separating device.