Polypore International, Inc. develops and manufactures microporous membranes. The Company offers lithium and lead-acid battery separators that enable mobile and portable energy. It operates two energy storage businesses. Its lithium-ion business focuses on electronics and electric drive vehicle (EDV) applications while its lead-acid business focuses on transportation and industrial applications. Its electronics and electric drive vehicle business offers lithium-ion battery separators to electric drive vehicles, energy storage systems (ESS), portable handheld devices, power tools, and lawn and garden equipment. Its transportation and industrial business offers battery separators for lead-acid, and specialty applications to cars, trucks and motorcycles; golf carts, forklifts and wheelchairs; renewable energy; uninterruptable power supplies, and inverters. It offers the brands, including Celgard electronics and electric drive vehicles and Daramic transportation.