There are two benefits to using a broadband model in battery gauging. First, the model can be used to enable battery resistance estimation in situations where the battery terminal voltage has not fully settled. The broadband model can prevent inaccurate IR voltage drop due to dynamic load current. The variation of the resistance with aging can be tracked regardless of the load current characteristics, so remaining battery capacity can be predicted correctly for applications with dynamic load currents. Second, the model can be used to more accurately predict the battery terminal voltage, accounting for the transient response.