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In a bid to perform model-based diagnostics on the electrical network of an automobile, experimental work and analysis was conducted to model an automotive lead-acid battery over the domain in which one is expected to operate. First, a thorough literature review discusses past attempts at modeling, as well as state and parameter estimation. Also, the literature on the aging and failure modes of batteries is presented. Next, the model selected is described, consisting of a locally linear time-invariant system approximation of a globally nonlinear time-variant battery. To obtain the parameters best enabling this approximation, a series of experiments were performed on a battery, the methodologies of which are detailed. Finally, the details of parameter extraction are also presented, along with their results. 2 Acknowledgments Many warm thanks to Drs Rizzoni and Guezennec for their support and inspiration. T