I purchased two Duralast Gold batteries for my Excursion almost 3 years ago. The engine had a sluggish start so I went up to AutoZone and they tested the batteries.

As suspected, one went bad. They looked up the purchase in their system and fortunately for me there was a few months left on their warranty.

The manager said replace them both. Based off his experience once one went bad the other was soon to follow. One of the employees even installed them while I went with my wife to eat Italian food across the street. I tipped him twenty bucks for the hard work and the great customer service.