The following quoted from Nigel Calder's Mechanical and Electrical Manual may be instructive: "A battery can show a full or nearly full charge on both an open circuit voltage test and a specific gravity test, yet still fail to operate correctly due to a severe loss of capacity due to sulphation of the plates or shedding of active material. The voltage and specific gravity are merely reflecting the fact that the remaining capacity is fully charged. To check the capacity itself some form of a load test is needed, normally using a high load tester" This is what your auto storee used. You can also buy a draw down tester (same thing) for 20 bucks from Harbor Freight.

 

They sure did. The weird thing was when I woke up in the morning the light on the MINI battery was green. So I was thinking oh crap, it's something else and not the battery.