The multi-layered band comprises a support (1) configured to hold at least one battery structure (10) formed by a plurality of overlapped layers including a porous material (11), and two electroactive electrodes (12, 13), one oxidizing (12) and one reducing (13), separated at a certain distance between them and in touch with said porous material (11). The battery structure (10) is configured to be activated upon the addition of a fluid into a given region of the porous material (11) and to provide electrical energy while said fluid impregnates by capillarity the porous material (11). The overlapped layers are constituted by parallel strips extending longitudinally along the length of the support (1), such that said multi-layered band can be cut transversally providing individual batteries of a same or different width each including the porous material (11) and the two electroactive electrodes (12, 13).