Mathematical modeling of batteries on the continuum scale will be reviewed in this presentation by way of several examples taken from my career. The purpose of such modeling is usually to develop a model that can be used to make predictions of the performance and perhaps the degradation of a battery of interest. Typically, we seek a model that is as simple as possible, but does not “throw the baby out with the bath water.” In addition, we seek a model that does not require significant computation time since it is necessary to validate the model based on experimental data. It has been and still is a challenge to develop a model of a battery of interest in a timely manner so that it will be useful in industry. Fortunately, software such as COMSOL Multiphysics is available now to assist in the development of models of batteries and includes a significant library of such models. Several examples of industrially useful mathematical models of batteries will be presented.