Service time voltage curves

Model-based predictions of battery performance and longevity are required to provide depletion indicators for batteries such as RRT (recommended replacement time), typically based on discharge voltage or resistance, to allow patients to schedule a replacement surgery before batteries reach EOS (end of service). Electrical characteristics of primary batteries used in medical applications have been modeled in a variety of ways including empirically or thermodynamics-based voltage curve models [16,17], equivalent circuit models [18,19], resistance models [11,20], and more recently physics-based comprehensive models [17, 21-23] that can be used to predict pulse performance [24],... 

To determine the electrical properties of plastics in a fashion useful for engineering purposes, it is necessary to duplicate conditions of service as closely as possible. However, these conditions are not always known, and can never be completely duplicated in the laboratory. In fact, simple rather than complex and lengthy tests are frequently justified. Electrical properties should be detei mined as a function of variables such as temperature and time. Time is an important variable in voltage degradation and moisture exposure. Properties should be given in the form of a curve where possible. Some plastics manufacturers supply such data. 

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