-Optimized Battery Performance and Reliability means no corrosion. Power One batteries have stainless steel housing which offers high stability and safe protection against corrosion. -Power One batteries have a threefold sealing design and patented PTFE film technology providing additional reliability and safety. -Precision manufacturing process fully to ensure consistent quality cell after cell. -Every battery is tested for its electrical and mechanical characteristics in compliance with its specification. -Tab technology guarantees longer shelf life proven under extreme climatic conditions in long term testing. -Each battery activates within seconds after removal of tab.