I am trying to figure out a simple, DC based way of approximating the internal resistance of the battery. I am familiar with the concept of instantaneous measurement, like here:
But the problem with that is that this method does not specify the time after which the measurement has be taken after applying load. This makes me believe there should be a continuous method, in which we sample the voltage with load with time and draw a curve that would somehow help to estimate the resistance.
How can this be achieved?