Why? Because non AGM battery last 2 years or less in Texas, Arizona, New Mexico. AGM will last 5-6 years. Heat kills non AGM batteries. Summer time the local auto parts stores parking lot are littered with cars needing new batteries.WHY ... is everyone hung up on getting AGM ... or "nothing" ?????? Apparently this is some sort of upper-crust-society whim, and not an actual needs-based-criteria ....... ! I get my regular Lead-Acid batteries to go over TEN years when I take the time to accurately check them at least once per year : this is really simple compared to checking Tires, Coolant, Oil-Changes (YUCK- Really "FILTHY" subject !), and the other things that go along with pro-active Vehicle Ownership !