Abstract: A method and device for supplying electrical energy to an electrical load using a set of chargeable and dischargeable direct current sources is provided. In a first step, all the direct current sources of the set are charged. In a second step, the first of the set of direct current sources is connected to the load in order to supply electrical energy to the latter. After a predetermined time, the connection between the first direct current source and the load is broken. The two preceding steps are repeated for each following direct current source. The three preceding steps are repeated, during which the direct current source connected to the load charges, via a charging device, at least one of the other direct current sources such that each direct current source of the set of direct current sources passes through a discharge-charge cycle.