An energy bank includes a plurality of integrated energy storage devices including a plurality of supercapacitors, a plurality of batteries and a plurality of metal shells. Each of the integrated energy storage devices includes a battery, a supercapacitor surrounding the battery, and a metal shell surrounding the supercapacitor. The supercapacitor forms a shell around an exterior surface of the battery. The battery includes a first anode, a first cathode, and an electrolyte disposed between the first anode and the first cathode. The supercapacitor includes a second anode, a second cathode, and a separator disposed between the second anode and the second cathode.