Device for batteries, storage batteries, cells and the like, for emergency lighting appliances

A device (1) for batteries, storage batteries, cells and the like, particularly for emergency lighting appliances, comprising at least one flexible sheet (2), which is designed to cover the outer surface of a battery (3), the sheet (2) comprising at least one layer (4) which is constituted at least partially by a material that has a predefined value of electrical resistivity, moreover the sheet (2) comprising at least one temperature adjustment unit (5), for the opening/closing of the electric power supply circuit of the layer (4), the temperature adjustment unit (5) being generally arranged on the outer surface of the sheet (2), in the closed configuration of the power supply circuit, the layer (4) being heated by the Joule effect with consequent heating of the battery (3).