Interesting thought. Maybe some of those batteries were good, but were tested prior to reconditioning?I got one, but the truth of the matter is that you REALLY don´t need it. 99% of the batteries wich we put to that test show "faulty". Why? Because you KNEW they were faulty before putting them to the test. What we do is not testing, but asking for some sort of a miracle.
None of us ever had to test a REALLY GOOD battery, did you?
In 1980 I was in high school, no money, and had a battery failure on my 1972 Chevy El Camino. Went to Sears and they put the battery on a tester. and it failed. They sold me a new battery for $60, which was huge money for me. El Camino started for three days- then same problem, battery was dead. Problem ended up being a loose belt on the alternator. That $60 meant a lot to me in 1980, and I replaced a likely good battery that tested bad.
I have found way to many w220 battery failures after sitting in a auction lot. These batteries held a charge and were functional prior to sitting for a few weeks/months. I simply want to better understand why the w220 batteries do not come back from full discharge, while many standard lead batteries often do. Maybe AGM design- heck if I know, but I am learning more about batteries- maybe it will make me anal retentive when it comes to trickel charging. We will see when I test and/or try and put the w220 battery in service that I have been trying to service for the past two weeks.