Method for detecting a proper connection of at least one energy store to an on-board electrical system

A method for detecting correct connection of at least one energy reservoir to a vehicle electrical system of a motor vehicle. The method includes: ascertaining a voltage dropping at the energy reservoir, and/or a current flowing through the energy reservoir, and/or a voltage present at a terminal as a representative of the electrical system voltage, when the electrical system voltage exceeds or falls below at least one desired voltage, preferably as a function of at least one magnitude characteristic of the energy reservoir, such as an open-circuit voltage or gassing voltage; comparing the ascertained magnitude, such as the voltage and/or current, with at least one limit value; correct connection of the energy reservoir to the vehicle electrical system, or at least one fault, is inferred as a function of the comparison.