A battery label is provided comprising a polyimide substrate defining an outer face and an oppositely directed inner face. The battery label also comprises a layer of a flame retardant-containing pressure-sensitive adhesive disposed on the inner face of the polyimide substrate. The polyimide substrate comprises an inorganic pigment dispersed throughout the substrate. The battery label exhibits a flame retardancy vertical rating for thin materials at least 0 (VTM-0).
