I'm aware of issues with a particular motor club that sells batteries to members on site. I saw a driver using an MBC-5500 tester which as near as I can tell is made by Midtronics, though can't seem to find much about that specific tester.
Supposedly these guys test the battery and charging system yet there are constant issues with the car dying shortly after installation of the battery. Supposedly the auto club tester diagnoses whether the problem is the battery or alternator, voltage reg but frequently there are issues where the alternator and/or volt reg turn out to be bad when the customer has been told the battery is the problem and has been sold a battery on that premise.
Further, when it comes to warranty replacement of the battery, the auto club's guy says the battery "tests good" when the mechanic's tester says it's bad. The auto club won't replace the battery under warranty unless their tester says it's bad.
Any thoughts, opinions, experiences?