Method for charging an auxiliary power-storage module

The method involves measuring charging state of an auxiliary energy storage module i.e. super-capacitor (8), in a micro-hybrid system (1). A control module (4) is controlled so as to electrically charge the storage module by using charging units in two modes, when the charging state of the storage module is below a predetermined charging state threshold value during rotation of a thermal engine (9) that is started by using an auxiliary starting device (14) of the micro-hybrid system. The auxiliary energy storage module supplies electric energy to a searchlight, car radio, cooling device and windscreen wiper. An independent claim is also included for a control module comprising a measuring unit for measuring charging state of an auxiliary energy storage module.