I don't have one in my 84 Westfalia but I do have one in my 67 MGB that has been in it for 10 years. MGB has been off of the road for 5. But two weeks ago I pulled the battery took it to work and tested it on the new Rotunda(Ford factory tool brand) battery tester  and it said charge and test agaon. I charged ot on slow charge for 6 hours and retest battery and came up good. Have been using car on and off for last two weeks finding out what the MG is going to need to be road worthy again. Mg has sat for 4 days and started it after work and went for ride no problen\ms. I am impressed with Interstate batterys. I lived in PA in the Mountains and in NJ with MG has been in freezing weather and over 100 degrees. 
Eric P
1984 Westfalia(Green Hornet)
1967 MGB
1973 Norton Commando 850(Ed)

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