You may be on to something Dan. I have had several (I maintain 8) Interstate batteries and have had great success (been buying them for over 15 yrs.) and all lasted 5yrs. Well only one 2 yr. failure. I check my batteries often. If you take care of them they last for a long time. Keep the water up and charge them correctly. Having said that my last one has a lower voltage than any other one I have had. Just 30 days old now, but when you check the water its fine.
You can have a failing battery but still meet the requirements from the battery manufacture. So far I have been treated great from Interstate. I have had one in that condition and if you work it they understand yours is failing and will make you a deal.
Still sticking to this battery untill they prove other wise.
Just my 2 cents worth.


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