> ## Documentation Index > Fetch the complete documentation index at: https://docs.ionworks.com/llms.txt > Use this file to discover all available pages before exploring further. # Introduction > Technical guide to battery electrochemistry, PyBaMM modeling, parameterization, data fitting, and design optimization. This Technical Guide covers the science behind lithium-ion batteries and battery modeling — electrochemistry, numerical methods, parameter identification, and design optimization. The content is vendor-neutral and aimed at building intuition rather than walking through any specific tooling. For hands-on workflows using the Ionworks stack (pipelines, simulations, optimizations, the Python API), see the [Documentation tab](/introduction). ## Table of Contents ### Batteries 101 Learn the fundamentals of lithium-ion battery science, from basic electrochemistry to system-level considerations. How batteries work, electrode essentials, open circuit voltage, and reaction kinetics Battery capacity, state of charge, internal resistance, and thermal behavior State of health, degradation mechanisms, SEI growth, lithium plating, and mechanical effects Battery packs and battery management systems ### Modeling Understand the numerical methods and models used for battery simulation. How PyBaMM discretizes PDEs into systems of ODEs and DAEs Model initialization, electrode state of health, and initial concentrations Multi-Species Multi-Reaction thermodynamic model for OCP and diffusivity The four binary-electrolyte transport properties and how they are measured ### Parameterization Parameter calculations, data fitting, and workflow orchestration concepts. Fire-and-forget execution for single-datafit or single-validation workflows How pipelines chain direct entries, calculations, and data fits to transform parameters Drop-in literature parameter sets, including electrolyte transport properties Estimating model parameters from experimental data ### Optimization Design optimization for battery performance targets. Optimizing design parameters to achieve performance objectives ### Reference Terminology and conventions used throughout the documentation. Battery modeling terminology and conventions