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We have a local guy here who buys all of the Interstate batteries that have been sitting in the wharehose for more than 3 months. I bought my 3 Group31 semi batteries for $80 each. 3 year replacement warranty. Interstate pulls their labels off.
Lot's of people swear by Interstates but my last one didn't even last three years in the Tahoe.
Last year I opened an account with Batteries Plus so I save 20% as long as I spend $500 a year (I can easily do that with UPS batteries for the office). So with that savings I bought an AGM for the 911 and another 850cca for the K10. We'll see how those work....