Is this the Auto Meter tester ?

https://www.nationaltoolwarehouse.com/In...CFQ62wAodQswA9w

I do this as part of my job.

Having a base line and knowing he design specifications is key to figuring out a batteries health and expected longevity.

Randomly testing a battery will tell pretty much nothing beyond is it bad right now.

Now if you were to test the battery new, then at every oil change you could log and track the data and come up with something useful.

I agree having baseline measurements is essential.

With so many batteries having less than 4 year real world lifetimes, baseline numbers must be of $ value.

I have long suggested that everyone set their tire pressure and then do a steady 60 mph fuel economy test over 60 miles on a mostly level interstate highway on a low wind day.

This baseline is a great help when something seems unhealthy with a vehicle,
despite the limitations of plus/minus 8% varying fuel heat content and decreasing tread depth giving mpg gains.

Here on Moparts there have been valuable past posts about baseline numbers of cylinder compression checks, and cylinder % leakdown.

"what is the base rate?"

Allegedly Nobel Prize winner Kahneman said that is the most important question to ask,
According the the new book:
The Undoing Project, by best selling author Michael Lewis

https://www.amazon.com/Undoing-Project-Friendship-Changed-Minds/dp/0393254593

You mentioned you're putting the battery in your basement. DO NOT put it on the concrete floor (in the basement or garage). This will kill a battery literally overnight.

urban legend

myth

not correct

Quit telling this fib