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
'03 Ram 2500 CTD, 5.9HO six speed, PacBrake Exh Brake, std cab, long bed, Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.