Newman-type models are the most widely used implementation of porous electrode theory to simulate Li-Ion batteries by both industry and academia. These models show great robustness, fidelity, and for most applications they require to fit ~80 material parameters to match the measured experimental data. While it is always possible to match the experimental results with these models, a methodology to quantify their veracity and identify the regions of validity remains unavailable. In general, it is necessary to identify the conditions under which the micro and macroscopic scales are decoupled, and conditions where the assumptions associated to using average microstructural properties remain enforced. In this project, the effect of the microstructure in the modeling and validity of Newman-type models is described by the formal application of upscaling techniques and the use of microstructurally averaged properties.