Best automotive battery I have encountered so far. In Mar of 2018 I bought a RAM 2500 truck built on Jan 3, 2003. When I bought it, it still had the original Damiler-Chrysler labeled batteries in it (they appeared to be the "green eye" Delco/Delphi maintenance free batteries, with the green eye covered by the label.) I got good maintenance records on the truck and given the batteries labeling and the records, I had no reason to think these were not the original 15 year batteries. That Cummins did crank with some hesitation, and that was the first money I spent was for two new Bosch AGM batteries for the truck.
I have used the Delco maintenance free batteries for years, and got good service, typically 8 or 9 years. They are too expensive now and don't have the reliability they used to.
I have a Advance Auto Platinum AGM group 49 battery in my shop that came out of my WBO MH in 2017, It is a 2011 date code battery and I changed it prior to a long trip. It still works and I recently used it to start a borrowed Ford 4000 tractor, and it worked just fine. Batteries hold up better than they used to.
Charles