That is very interesting. But would you not need to stock different resistors with proper loads for different voltage and mAh batteries? I've used the ZTS and it seems to allow for these issues.

One resistor of 100-300 Ohms should get the job done for all the batteries in the video. One resistor is a few pennies. A pack of many resistors is a few bucks. I have a multimeter and test batteries fine. I have even identified dead car batteries accurately. I can also test to see if a power outlet is hot and generally check house wiring. There are many other uses for a multimeter that costs about $15.

I'm sure battery tester works fine. I'm just saying what I would buy if I did not already have a multimeter.

Many good (and some cheap -- i.e. free from Harbor Freight with a purchase) multimeters include a battery test function that uses a load cell. I highly agree that a multimeter should be on everyones list.

Respectfully,

Jerry