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Battery design life is predicated on conditions that may be generic to the application. Integrated in some fashion is the warranty against manufacturing defects. The actual installation of batteries can have a profound effect on actual service life. Many European manufacturers offer a different warranty for the same battery sold in the US. In the meantime, certain standards, including IEEE 535, mandate battery evaluation procedures that provide a predictable expected life from the batteries. This paper will address each of these aspects, provide an understanding of the differences between the four life attributes, and look at differentiating warranties from both design life and service life.