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High Quality Big Roll PE Battery Separator for Car. Extended Battery Life: Ribs minimize separator cracks caused by oxidation, extending battery lifespan. Customizable Thickness: Available base thickness from 0.2mm to 0.45mm and total thickness up to 1.5mm. Versatile Ribs Options: Offer Big Ribs, Mini Ribs, Twill Ribs, and Smooth types for various needs. High Porosity: Porosity is at least 55% for optimal oxygen transfer and performance. OEM/ODM Service: Full OEM and ODM services provided for all product types. ISO9001 Certified: Factory holds ISO9001 authentication ensuring strict quality control. Wide Application Range: Suitable for cars, boats, golf carts, solar storage, and electric vehicles.