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Calculating internal battery resistance will give a bit more reliable info of the status and future life of the battery.For a bit more concrete info:https://learn.sparkfun.com/tutorials/measuring-internal-resistance-of-batteries
Do you know that those bad batteries were measured good using the analog or even with a digital multimeter? The battery voltage drop the moment you connect it with a load. With the ESR meter, you don’t need to connect the battery to a load and you will know how good is the battery by just observing the ESR ohm test result. If you are not sure of the good ESR ohm value for a particular battery, you can always compare it with a good one or you can even draw up your own ESR meter chart for battery if you have the time.