The SAIC Battery Thermal Solver is a tool that allows for the evaluation of the thermal response under a variety of cell types, loading conditions and packaging alternatives for the battery designer, manufacturer, or system integrator. Developed with a user-friendly interface, the Battery Thermal Solver allows for a number of simulations to be performed. This paper discusses the capabilities of the Battery Thermal Solver Tool through a thorough discussion of the battery thermal problem—from cell heat generation, heat transfer mechanisms, to the effects of alternative packaging strategies.