Walmart uses Midtronic testing machines, I would get it tested there, plus they have the least expensive / best warranty batteries availalble
I use Midtronics testers at work for use on invertors. We use the Ultra and the Essential models. They measure the Siemens (used to be called mhos = 1/Ω). They can measure just the battery or the battery and a cable. Does anyone know the Siemens of the factory batteries? I assume there are more than one supplier, so that will make a difference as well.
Not sure if any of this will help anyone, just adding to the confusion is all...:2cents: