It does seem there are so many variables and conflicting info online to make it questionable. One thing I find odd, which has nothing to do with the battery type, is that when I disconnected the stock battery to switch for 2ish hours, nothing reset. No setting, radio presets, or anything. Didn’t even get dash lights that I would expect requesting resetting for a power loss. I did drive the car for about half an hour today. got up to 15.2v maxi settled at 15.1. I had my nose system full blast playing some hay-z with ac on, heated seats on both seats and cooling as well as lights on, and voltage dropped to 15. Less. Than I expected. I kept start/stop on to test it and the car turned back on around 13.5Ish Volts. The AGM was around 12.8v and didn’t last as long as the lithium I feel. The agm I have is about 2 years old, so that is a factor. But even starting is noticeably faster in all modes.