AGM batteries may be coming when these go bad.
Ron
Hi Ron,
AGM techology?

You probably heard me say this a time or two before...
If switching from 12v lead acid, to 12v AGM, consider 6v AGM. My experience
HERE making the 2x switch has been wonderful. I did have to ditch the slide out tray which was a very good thing. No more worries about the cables getting kinked and potentially loosening from the battery terminals. No need for a battery tray with sealed AGMs. Set them inside, lock them down, hook them up, and you're done for many years.
If I remember correctly, you have an elaborate battery monitor. I installed an "easy to see" volt meter
HERE which did wonders for basic battery monitoring. It took one good trip to understand the fluctuations in the readings and recognize when it's time for a charge.
Ron Dittmer