Abstract: An electronic monitoring unit for an electrical energy storage system that comprises multiple series connected components, includes a corresponding number of measurement devices. Each measurement device is connected to one such component and measures at least one storage status indicator thereof. In one embodiment, the measurement devices are connected in series, and each successive measuring device evaluates the measurement value for its associated storage device relative to measurement data received from the previous measuring device, based on one of more prespecified evaluation criteria. Alternatively, the measurement devices are connected in parallel to a joint signal connection and transfer their measurement values in parallel through the joint signal connection, in a form suitable for the determination of minimum and maximum values.