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Plug-in Hybrid Electric Vehicles (PHEVs) offer the ability to significantly reduce petroleum consumptions. Argonne National Laboratory (ANL), working with the FreedomCAR and Fuels Partnership, participated in the definition of the battery requirements for PHEVs. Previous studies have demonstrated the impact of vehicle characteristics such as vehicle class, mass or electrical accessories. However, outstanding questions remain regarding the impact of drive cycles on the requirements. In this paper, we will first evaluate the consequences of sizing the electrical machine and the battery powers to follow the Urban Dynamometer Driving Schedule (UDDS) to satisfy CARB requirements, including how many other driving cycles can be followed in Electric Vehicle (EV) mode. Then, we will study the impact of sizing the electrical components on other driving cycles.