I have been using the Costco 6V batteries for over 10 years (not one set for all this time). I replaced my first set at 7 years just because it seemed like time. I am now up to 6 batteries (3 pairs) as we do boondock for weeks at a time.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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