NOVELTY – The method involves connecting a converter with an ultracapacitor. The converter is connected with a battery. Flow of current in the ultracapacitor and the battery is controlled. A control variable of the ultracapacitor is compared with input current of the converter. The control variable of the converter is compared with input current of the battery. An inverter is connected with an alternating current motor. The ultracapacitor is connected with an electrical energy storing device, where voltage of the inverter is different from voltage of the ultracapacitor. USE – Method for controlling a storage system. Uses include but are not limited to car, bus, golf cart, forklift, battery, cell phone and camera. ADVANTAGE – The method enables realizing power demand between storage devices to improve performance of electric vehicle, electronic devices, and batteries, and utilizing simple technique to improve performance of the electric vehicle and of the batteries. DETAILED DESCRIPTION – INDEPENDENT CLAIMS are also included for the following: (1) a control device for a hybrid system (2) a storage system. DESCRIPTION OF DRAWING(S) – The drawing shows a schematic view illustrating a method for controlling a storage system. Channels (1-3)