I seriously question the age of those Walmart batteries used in that Project Farm video. I have a Walmart MAXX 23F in my CR-V that will be 4 yo in one month from now, and I have tested it many many times with my electronic tester and at a 90% SOC ( state of charge ) charge or > it has always shown a SOH ( state of health ) = 100 % , and it still does.
Granted, mine probably was not made in S. Korea, but 80 something SOH with a > than 90 % SOC , with any new flooded lead acid battery is pathetic. That's the range of SOH ya see with batteries that have aged out and are ready to die.
This Project Farm battery video is a real heads up ( warning ) to test any "new" vehicle battery before buying it.
If when my current 24F needs replaced, the 24F batteries in stock at my local WM show a SOH below 95% , I will go to an O' Riley's and shel out the extra cash for a 24F "Super Start Extreme" ( their best flooded lead acid battery, top tier ) , AFTER I ALSO TEST THAT BATTERY and it test > 90% SOH. Heck, I probably would not buy any new FLA battery that tested < 100 % SOH.
Also, new FLA batteries that are good, should test > 1.33 X the rated CCA when warm and new. My 24F WM MAXX rated 725 CCA when new, warm sitting in the store shelf before I bought it in September of 2022, tested 1117 CCA.
It is what it is. Maybe WM flooded lead acid batteries are no longer worthy of being the go-to source any longer. Testing at time of purchase will tell.
Those little hand held testers work, and certainly are worth buying. The price of most on Amazon has gone up a lot over the years. But WM online sells them at a much lower price.