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The Batteries & Fuel Cells Module is a specilized tool designed to model all types of battery and fuel cell applications. The Module features tailored interfaces to study primary, secondary and tertiary current density distributions in electrochemical cells. The cell can contain solid or porous electrodes and the dilute or concentrated electrolytes. Additionally multiphysics couplings such as heat transfer, fluid flow and electrochemical reactions can be added through the multiphysics capabilities of COMSOL.