This PET protective film is designed for surface protection in lithium-ion soft pack batteries, serving as a reliable barrier against scratches, contamination, and minor mechanical stress during assembly and handling. The material, commonly referred to as battery-grade Mylar, offers consistent thickness options of 55 μm and 60 μm, available in roll lengths of 100 m and 50 m respectively, to accommodate different production scales. Its polyester (PET) base provides good dimensional stability and chemical resistance suitable for experimental and energy material applications. Typically used as a protective layer for pouch cell surfaces, it helps maintain electrode integrity and insulation during processing. This film is compatible with standard battery fabrication workflows and is particularly relevant for R&D labs and small-scale manufacturing where surface quality is critical.