The stainless steel housing offers high stability and safe protection against corrosion. power one cells provide additional reliability and safety due to - threefold sealing design - patented PTFE film technology. FRESH BATTERIES Shelf life 2-3 years. We sell the Genuine Pack like the picture made in Germany Original Germany pack of 60 batteries High Quality Zinc Air Battery size 312 or Brown tab Proven under extreme climatic conditions in long term testing